When God made his promise to Abraham, since there was no one greater for him to swear by, he swore by himself,114
saying, "I will surely bless you and give you many descendants."a215
And so after waiting patiently, Abraham received what was promised.316
Men swear by someone greater than themselves, and the oath confirms what is said and puts an end to all argument.417
Because God wanted to make the unchanging5 nature of his purpose very clear to the heirs of what was promised,6 he confirmed it with an oath.
God did this so that, by two unchangeable things in which it is impossible for God to lie,7 we who have fled to take hold of the hope8 offered to us may be greatly encouraged.