Hebrews 6:18 WEB

¹⁶  For men indeed swear by a greater one, and in every dispute of theirs the oath is final for confirmation.

¹⁷  In this way God, being determined to show more abundantly to the heirs of the promise the immutability of his counsel, interposed with an oath;

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

¹⁹  This hope we have as an anchor of the soul, a hope both sure and steadfast and entering into that which is within the veil;

²⁰  where as a forerunner Jesus entered for us, having become a high priest forever after the order of Melchizedek.