Hebrews 6:12-17
6:12 so that you may not be sluggish,
but imitators of those who through faith and perseverance inherit the promises.
6:13 Now when God made his promise to Abraham, since he could swear by no one greater, he swore by himself,
6:14 saying, “Surely I will bless you greatly and multiply your descendants abundantly.”
6:15 And so by persevering, Abraham inherited the promise.
6:16 For people swear by something greater than themselves, and the oath serves as a confirmation to end all dispute.
6:17 In the same way God wanted to demonstrate more clearly to the heirs of the promise that his purpose was unchangeable, and so he intervened with an oath,