BLB(i)
13 For God, having made His promise to Abraham, since He had no one greater to swear by, swore by Himself,
14 saying, “Surely if blessing, I will bless you; and multiplying, I will multiply you.”
15 And thus having waited patiently, he obtained the promise.
16 For men swear by one greater, and an end of all their disputes, for confirmation, is the oath,
17 in which God, desiring to show more abundantly the unchangeableness of His purpose to the heirs of the promise, guaranteed it by an oath,