Hebrews 7:21-25

21(for those Levites who formerly became priests [received their office] without [its being confirmed by the taking of] an oath, but this One [was designated] with an oath through the One who said to Him, “The Lord has sworn And will not change His mind or regret it, ‘You (Christ) are a Priest forever’ ”).

22And so [because of the oath’s greater strength and force] Jesus has become the certain guarantee of a better covenant [a more excellent and more advantageous agreement; one that will never be replaced or annulled].

23The [former successive line of] priests, on the one hand, existed in greater numbers because they were each prevented by death from continuing [perpetually in office];

24but, on the other hand, Jesus holds His priesthood permanently and without change, because He lives on forever.

25Therefore He is able also to save forever (completely, perfectly, for eternity) those who come to God through Him, since He always lives to intercede and intervene on their behalf [with God].