Hebrews 6:13-15

Amplified Bible

¹³ For when God made the promise to Abraham, He swore [an oath] by Himself, since He had no one greater by whom to swear, ¹⁴ saying, “I will surely bless you and I will surely multiply you.”^{(A) 15} And so, having patiently waited, he realized the promise [in the miraculous birth of Isaac, as a pledge of what was to come from God].