Hebrews 6:17-19

17Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:

18That by two immutable things, in which it was impossible for God to lie, we might have a strong consolation, who have fled for refuge to lay hold upon the hope set before us:

19Which hope we have as an anchor of the soul, both sure and stedfast, and which entereth into that within the veil;