Hebrews 6:17-20

17In the same way God, willing more abundantly to show to the heirs of promise the immutability of his counsel, confirmed it by an oath:1 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 steadfast, and one which entereth into that within the veil; 20Where the forerunner hath for us entered, even Jesus, made an high priest for ever after the order of Melchizedek.