Hebrews 6:16-18

16For men indeed swear by the greater, and an oath for confirmation is for them an end of all dispute.

17Thus God, determining to show more abundantly to the heirs of promise the immutability of His counsel, confirmed it by an oath,

18that by two immutable things, in which it is impossible for God to lie, we might have strong consolation, who have fled for refuge to lay hold of the hope set before us.