[ἐπιδιατάσσομαι] middle voice from G1909 and G1299; to appoint besides, i.e. supplement (as a codicil)
Usages throughout the bible
Galatians 3:15
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Brethren, I speak after the manner of men; Though it be but a man's covenant, yet if it be confirmed, no man disannulleth, or addeth thereto. G1928