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Commentary on Galatians 4 verses 21–31
In these verses the apostle illustrates the difference between believers who rested in Christ only and those judaizers who trusted in the law, by a comparison taken from the story of Isaac and Ishmael. This he introduces in such a manner as was proper to strike and impress their minds, and to convince them of their great weakness in departing from the truth, and suffering themselves to be deprived of the liberty of the gospel: Tell me, says he, you that desire to be under the law, do you not hear the law? He takes it for granted that they did hear the law, for among the Jews it was wont to be read in their public assemblies every sabbath day; and, since they were so very fond of being under it, he would have them duly to consider what is written therein (referring to what is recorded Gen. 16 and 21), for, if they would do this, they might soon see how little reason they had to trust in it. And here, 1. He sets before them the history itself (Gal 4:22, Gal 4:23): For it is written, Abraham had two sons, etc. Here he represents the different state and condition of these two sons of Abraham - that the one, Ishmael, was by a bond-maid, and the other, Isaac, by a free-woman; and that whereas the former was born after the flesh, or by the ordinary course of nature, the other was by promise, when in the course of nature there was no reason to expect that Sarah should have a son. 2. He acquaints them with the meaning and design of this history, or the use which he intended to make of it (Gal 4:24-27): These things, says he, are an allegory, wherein, besides the literal and historical sense of the words, the Spirit of God might design to signify something further to us, and that was, That these two, Agar and Sarah, are the two covenants, or were intended to typify and prefigure the two different dispensations of the covenant. The former, Agar, represented that which was given from mount Sinai, and which gendereth to bondage, which, though it was a dispensation of grace, yet, in comparison of the gospel state, was a dispensation of bondage, and became more so to the Jews, through their mistake of the design of it, and expecting to be justified by the works of it. For this Agar is mount Sinai in Arabia (mount Sinai was then called Agar by the Arabians), and it answereth to Jerusalem which now is, and is in bondage with her children; that is, it justly represents the present state of the Jews, who, continuing in their infidelity and adhering to that covenant, are still in bondage with their children. But the other, Sarah, was intended to prefigure Jerusalem which is above, or the state of Christians under the new and better dispensation of the covenant, which is free both from the curse of the moral and the bondage of the ceremonial law, and is the mother of us all - a state into which all, both Jews and Gentiles, are admitted, upon their believing in Christ. And to this greater freedom and enlargement of the church under the gospel dispensation, which was typified by Sarah the mother of the promised seed, the apostle refers that of the prophet, Isa 54:1, where it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not; for the desolate hath many more children than she who hath a husband. 3. He applies the history thus explained to the present case (Gal 4:28); Now we, brethren, says he, as Isaac was, are the children of the promise. We Christians, who have accepted Christ, and rely upon him, and look for justification and salvation by him alone, as hereby we become the spiritual, though we are not the natural, seed of Abraham, so we are entitled to the promised inheritance and interested in the blessings of it. But lest these Christians should be stumbled at the opposition they might meet with from the Jews, who were so tenacious of their law as to be ready to persecute those who would not submit to it, he tells them that this was no more than what was pointed to in the type; for as then he that was born after the flesh persecuted him that was born after the Spirit, they must expect it would be so now. But, for their comfort in this case, he desires them to consider what the scripture saith (Gen 21:10), Cast out the bond-woman and her son, for the son of the bond-woman shall not be heir with the son of the free-woman. Though the judaizers should persecute and hate them, yet the issue would be that Judaism would sink, and wither, and perish; but true Christianity should flourish and last for ever. And then, as a general inference from the whole of the sum of what he had said, he concludes (Gal 4:31), So then, brethren, we are not children of the bond-woman, but of the free.
Philosophers, then, are children, unless they have been made men by Christ. "For if the son of the bond woman shall not be heir with the son of the free"
What! does all this consolation consist in showing that freemen are persecuted by bond-men? By no means, he says, I do not stop here, listen to what follows, and then, if you be not pusillanimous under persecution, you will be sufficiently comforted. And what is it that follows? "Cast out the son of the handmaid, for he shall not inherit with the son of the freewoman." Behold the reward of tyranny for a season, and of recklessness out of season! the son is cast out of his father's house, and becomes, together with his mother, an exile and a wanderer. And consider too the wisdom of the remark; for he says not that he was cast forth merely because he persecuted, but that he should not be heir. For this punishment was not exacted from him on account of his temporary persecution, (for that would have been of little moment, and nothing to the point,) but he was not suffered to participate in the inheritance provided for the son. And this proves that, putting the persecution aside, this very thing had been typified from the beginning, and did not originate in the persecution, but in the purpose of God. Nor does he say, "the son of Abraham shall not be heir," but, "the son of the handmaid," distinguishing him by his inferior descent. Now Sarah was barren, and so is the Gentile Church; observe how the type is preserved in every particular, as the former, through all the by-gone years, conceived not, and in extreme old age became a mother, so the latter, when the fulness of time is come, brings forth. And this the prophets have proclaimed, saying, "Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not; for more are the children of the desolate than of her which hath the husband." And hereby they intend the Church; for she knew not God, but as soon as she knew Him, she surpassed the fruitful synagogue.
(Vers. 29-31.) But as then he that was born according to the flesh persecuted him that was born according to the spirit, even so it is now. But what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman. So then, brethren, we are not children of the bondwoman, but of the free. In this liberty Christ hath made us free. I do not think it impossible to find where Ishmael persecuted Isaac; but only this, that when the son of the Egyptian, who was elder, played with Isaac, Sara was indignant, and said to Abraham: Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with my son Isaac. (Gen. XXI, 10). And certainly, a simple game among children is unworthy of expulsion and abandonment. But the Apostle, like a Hebrew among Hebrews, and instructed at the feet of the teacher Gamaliel, who once restrained the raging Pharisees against the Lord by council, understood from the words of Sarah saying: for the son of the maidservant will not inherit with my son Isaac, that that simple game was not. But because perhaps Ishmael, as the older one, and at that time already circumcised when he could understand and feel what he suffered, claimed for himself the right of the firstborn, the Scripture called the quarrel of the little ones a game. Unable to bear these words, Sarah, not enduring the custom of the firstborn claiming the rights of a slave woman's son from a young age, burst out in a voice: Cast out the slave woman and her son, for the son of the slave woman shall not inherit with my son Isaac. When this seemed harsh to Abraham (for greater things are always due to the firstborn), not only did Ishmael cease to be the firstborn, but he did not even receive an equal portion with his younger brother: God, who wanted the free woman to be inside and the slave woman to be expelled, confirms Sarah's words and speaks to Abraham: Let it not be harsh in your sight concerning the boy and the slave woman. Everything that Sara tells you, listen to her voice: for it is through Isaac that you will have descendants. Just as in the past, the older brother Ishmael persecuted the infant Isaac, claiming the privilege of circumcision and the rights of the firstborn; so now, according to the flesh, Israel (formerly Ishmael) rises up against the younger brother, the Christian people from the nations. Let us consider the foolishness of the Jews, who killed the Lord, persecuted the prophets and apostles, and opposed the will of God; and we will see much greater persecutions, as History also teaches us, stirred up by the Jews against the Christians than by the Gentiles. Do we marvel at the Jews? Even today, those who are born again in Christ and live spiritually are persecuted by those who still live in the flesh. And as they rise with Christ, they seek the things that are above, not the things that are below. Let them do what they want: let them persecute Isaac with Ishmael; let them cast out the bondwoman and her Egyptian mother. They will not inherit the promise, which only those who are born of the promise will obtain. And elegantly also, he who is born according to the flesh persecutes the spiritual. For the spiritual does not pursue the carnal; but forgives him as to a country brother: he knows that he can improve over time. And if at any time he sees the Egyptian son angry, he remembers the one father who created light, cattle, and mosquitoes: and in a great house, there are not only golden and silver vessels; but also wooden and earthen vessels. Therefore, let us say with the Apostle Paul: We are not slaves of the son, but free (2 Timothy 2); and being renewed in Christ, let us hear the words of the Lord speaking to the Jews: If you abide in my word, you will know the truth, and the truth will set you free (John 8:31, 32). The Apostle, liberated by this freedom, used to say: 'For although I am free from all, he who sins is a slave of sin' (I Cor. IX, 19). He, knowing himself free from all vices, from every desire and error, rightly rejoiced in the freedom of Christ saying: 'We are not slaves, but free: in this freedom Christ has set us free' (John VIII, 34).
By “the words of Scripture” he means those spoken of Sarah explaining the goal of the Scripture, for the sake of which he has written these things afresh, so that after the truth the type also may be explained.
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SUMMARY
Galatians 4:30 serves as a climactic declaration in Paul's allegorical argument, drawing directly from the Old Testament narrative of Abraham's household to underscore the fundamental incompatibility between a works-based righteousness and God's covenant of grace. This verse powerfully asserts that those who rely on human effort and adherence to the Law for salvation, symbolized by Hagar and Ishmael, have no inheritance in the divine promises, which are reserved exclusively for those who are children of God by faith, represented by Sarah and Isaac. It encapsulates the core message of Galatians: salvation is by grace through faith alone, not by works of the Law.
CONTEXT
EXPOSITION AND ANALYSIS
Key Word Analysis
Verse Breakdown
Literary Devices
Paul employs several potent literary devices in Galatians 4:30. The most prominent is Allegory, where the historical narrative of Abraham's family (Hagar, Ishmael, Sarah, Isaac) is reinterpreted to convey deeper spiritual truths about the covenants of Law and Grace. This allows Paul to draw a stark contrast between two irreconcilable paths to God. A Rhetorical Question ("Nevertheless what saith the scripture?") immediately grabs the reader's attention, inviting them to consider the authoritative voice of God's Word. This question also serves as an Allusion to Genesis 21:10, grounding Paul's theological argument in a familiar and respected Old Testament text. The entire verse is built upon a profound Contrast between the "bondwoman and her son" and the "freewoman and her son," symbolizing the antithesis between legalism and grace, and the different destinies associated with each. This contrast is further emphasized by the absolute nature of the "casting out" and the denial of inheritance.
THEOLOGICAL AND THEMATIC CONNECTIONS
Galatians 4:30 is a theological linchpin, asserting the absolute exclusivity of salvation by grace through faith. It unequivocally declares that the old covenant of Law, with its demands for human performance, cannot coexist with or contribute to the inheritance offered by the new covenant of grace. This verse underscores that God's plan for salvation is singular and unadulterated: it is a gift received by faith, not a reward earned by works. To attempt to mix Law and grace is to invalidate grace and to forfeit the promise. The "casting out" is not a rejection of individuals, but a definitive statement about the nature of God's saving work and the only means by which one can become an heir to His promises.
REFLECTION AND APPLICATION
Galatians 4:30 provides a crucial spiritual thermometer for believers today, challenging us to honestly assess the foundation of our hope and assurance before God. Are we truly resting in the finished work of Christ, or do we subtly, perhaps unconsciously, add our own efforts, good deeds, or religious observances to secure our standing with Him? This verse serves as a stark warning against any form of legalism, whether overt or covert, that seeks to mix human performance with divine grace. It calls us to live in the radical freedom that Christ has secured, understanding that our identity as "children of the promise" is a gift, not an achievement. Embracing this truth liberates us from the burden of striving for acceptance and empowers us to serve God out of love and gratitude, rather than fear or obligation. It reminds us that the inheritance of salvation, eternal life, and all spiritual blessings is an exclusive gift to those who trust in Jesus alone.
Questions for Reflection
FAQ
Does Galatians 4:30 mean that Jewish people are excluded from salvation?
Answer: No, Galatians 4:30 does not teach that Jewish people are excluded from salvation. Paul's allegory is not about ethnic lineage but about the basis of salvation. The "bondwoman and her son" represent those, whether Jew or Gentile, who seek to be justified by adherence to the Mosaic Law. The "freewoman and her son" represent those, whether Jew or Gentile, who are justified by faith in God's promise, which is ultimately fulfilled in Christ. Paul himself, a Jew, was saved by grace through faith, as he recounts in Galatians 1:11-16. The issue is not one's physical heritage but one's spiritual allegiance—whether to the Law as a means of righteousness or to Christ as the sole means of righteousness.
How does this verse relate to the concept of "works" in Christianity?
Answer: This verse strongly distinguishes between "works of the Law" as a means of justification and the good works that flow from a saved life. Paul argues vehemently against the idea that salvation is earned through observing the Law (the "works of the Law"). The "son of the bondwoman" represents this works-based system, which cannot inherit God's promises. However, this does not negate the importance of good works for believers. Rather, genuine good works are the result and evidence of salvation by grace, not its cause. As Paul later states in Ephesians 2:8-10, "For by grace are ye saved through faith... Not of works, lest any man should boast. For we are his workmanship, created in Christ Jesus unto good works."
CHRIST-CENTERED FULFILLMENT
Galatians 4:30 finds its ultimate fulfillment in Jesus Christ and the new covenant established through His sacrificial work. The "casting out" of the bondwoman and her son allegorically prefigures the definitive end of the Law as a means of salvation, and the establishment of Christ as the sole path to righteousness and inheritance. Jesus Himself is the "Son of the freewoman" par excellence, the true heir of all God's promises, through whom all who believe become children of the promise. His perfect obedience to the Law and His atoning death on the cross (Romans 10:4) fulfilled its demands, rendering it obsolete as a system for justification. Through faith in Christ, believers are no longer "under the law" but "under grace" (Romans 6:14), adopted into God's family as true sons and daughters (Galatians 4:4-7). Thus, the inheritance promised to Abraham's true seed is received not through the lineage of the flesh or the works of the Law, but solely through union with Christ, the ultimate "seed" (Galatians 3:16), who makes us co-heirs with Him (Romans 8:17).