Acts 7:8
And he gave him the covenant of circumcision; and so he begat Isaac, and circumcised him on the eighth day; and Isaac begat Jacob, and Jacob the twelve patriarchs.
Galatians 3:17
And what I mean is this; that a covenant that was before ratified by God, the Law, which came four hundred and thirty years after, cannot annul, so as to make void the promise;
Hebrews 6:17
Wherefore God, wishing more abundantly to show to the heirs of the promise the immutability of his purpose, confirmed it by an oath,
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