Cyprian

Finally, how inseparable is the sacrament of unity and how hopeless are they and what greatest perdition they seek for themselves from the indignation of God—they who make a schism and, after having abandoned their bishop, appoint for themselves another false bishop from without—the divine Scripture declares in the book of Kings, when from the tribe of Judah and Benjamin ten tribes were separated and, abandoning their king, appointed themselves another from without. “And the Lord was offended,” it says, “at all the seed of Israel, and afflicted them and delivered them up to plunder till he cast them away from his face because Israel was torn from the house of David, and they made Jeroboam son of Nabath their king.” It said that the Lord was offended and gave them over to perdition because they had been dispersed from unity and had appointed another king for themselves.And so great indignation of the Lord remained against those who had made the schism that even when the man of God had been sent to Jeroboam to upbraid him for his sins and to foretell future vengeance, he was forbidden also to eat bread and to drink water among them. Since he had not heeded this and had dined contrary to the precept of God, he was immediately stricken by the majesty of divine censure; on his return, he was killed on the journey by the attack and bite of a lion. And does anyone of you dare to say that the life-giving water of baptism and heavenly grace can be common with schismatics with whom neither earthly food nor worldly drink ought to be common?
Moreover, the Lord satisfies us in his gospel and reveals a greater light of understanding that the same people who then had separated themselves from the tribe of Judah and Benjamin and, after having abandoned Jerusalem, had withdrawn to Samaria should be reputed among the profane and the Gentiles. For when he first sent his disciples upon the ministry of salvation, he commanded and said, “Do not go in the direction of the Gentiles or enter the town of the Samaritans.” Sending first to the Jews, he orders the Gentiles to be passed over as yet; but, adding that the city of the Samaritans, where there were schismatics, ought to be omitted, he shows that the schismatics were in the same category as the Gentiles.