The Greek word ἐπιδιατάσσομαι (epidiatássomai), represented by G1928, means to add to or supplement. It appears only 1 time in 1 unique verse in the Bible. Its base definition, "to appoint besides, i.e. supplement (as a codicil)," points to the specific act of making an addition to an already existing and established agreement.
The sole biblical context for G1928 is Galatians 3:15. Here, the writer speaks "after the manner of men" to create an analogy. The verse explains that once a man's covenant G1242 is confirmed G2964, no one can legally disannul it or add thereto. The use of G1928 in this passage serves to illustrate the binding and unalterable nature of a ratified agreement, using a common human legal concept to make a theological point.
Several related words from its single context illuminate its meaning:
- G1242 diathḗkē (covenant): The foundational agreement that cannot be added to. Defined as a "contract (especially a devisory will)," it is the object of the actions in Galatians 3:15 and a key concept throughout scripture, as with the "new covenant" Hebrews 8:8.
- G2964 kyróō (confirm): Meaning "to make authoritative, i.e. ratify," this is the action that finalizes the covenant. Once a covenant is confirmed, it is protected from being added to Galatians 3:15.
- G114 athetéō (disannul): Used in direct opposition to G1928 in Galatians 3:15, this word means "to set aside... neutralize or violate." It represents the act of nullifying an agreement, which, like adding to it, is forbidden once confirmed.
The theological weight of G1928 is tied entirely to its use as a legal illustration.
- Finality of a Covenant: The word's primary function is to underscore the finality of a confirmed agreement. In the argument presented in Galatians 3:15, it establishes that a ratified covenant is closed to any further supplementation.
- Human Analogy for Divine Truth: By using this term in the context of what men do, the passage draws a parallel to the unchangeable nature of God's promises. If even a human covenant is protected from being added to, so much more is God's.
- Legal Inviolability: Paired with "disannulleth" G114, "addeth thereto" G1928 completes the picture of legal inviolability. A confirmed covenant cannot be diminished or expanded upon, making it a powerful metaphor for divine faithfulness.
In summary, G1928 is a highly specific term meaning to add to or supplement an existing agreement. Its single appearance in Galatians 3:15 is crucial, where it provides the legal language needed to build an argument about the unchangeable nature of a confirmed G2964 covenant G1242. It demonstrates how a precise word from human affairs can be used to illustrate the absolute reliability of a divine promise.
TRV