Hebrews 6:13-17

ACV(i) 13 For God who promised to Abraham, since he had none greater to swear by, swore by himself, 14 saying, Surely indeed, blessing I will bless thee, and multiplying I will multiply thee. 15 And this way, having patiently endured, he obtained the promise. 16 For men certainly swear by the greater, and of every dispute with them the oath is final for confirmation. 17 By which God, wanting to demonstrate more abundantly to the heirs of the promise the immutableness of his resolve, confirmed it by an oath.