Hebrews 7:20-24

20None of this happened without an oath. For others became priests without an oath,

21but he became a priest with an oath made by the one who said to him: The Lord has sworn and will not change his mind, “You are a priest forever.”

22Because of this oath, Jesus has also become the guarantee of a better covenant.

23Now many have become Levitical priests, since they are prevented by death from remaining in office.

24But because he remains forever, he holds his priesthood permanently.