Hebrews 7:21 Cross References - Williams

²¹ for the Levitical priests were appointed without His taking an oath, but He with His oath, when He said to Him: "The Lord took oath and will not change, You are a priest forever" --

¹⁶ For it is a custom among men to take oath by something greater than themselves, and an oath taken for confirmation settles any dispute among them. ¹⁷ Therefore, because God wanted to make the strongest demonstration of the unchangeable character of His purpose, He interposed with an oath, ¹⁸ so that by these two unchangeable things in which it is impossible for God to prove false, we who have taken refuge with Him may have encouragement strong enough to make us seize upon the hope that lies ahead of us.

¹⁷ For the Scripture bears witness: "You are a priest forever, with the rank of Melchizedek."