Acts 7:8
And He gave him a covenant of circumcision; and so he begat Isaac, and circumcised him on the eighth day; and Isaac, Jacob; and Jacob, the twelve patriarchs.
Galatians 3:17
But this I say: A covenant previously confirmed by God, the law, which came into existence four hundred and thirty years later, does not invalidate, that it should make the promise of no effect.
Hebrews 6:17
wherein God, more abundantly willing to show to the heirs of the promise the immutability of His counsel, interposed with an oath;
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