Hebrews 7:10

6 But Melchizedek, who did not trace his descent from Levi, collected a tenth from Abraham and blessed him who had the promises.

7 And indisputably, the lesser is blessed by the greater.

8 In the case of the Levites, mortal men collect the tenth; but in the case of Melchizedek, it is affirmed that he lives on.

9 And so to speak, Levi, who collects the tenth, paid the tenth through Abraham.

10 For when Melchizedek met Abraham, Levi was still in the loin of his ancestor.

11 Now if perfection could have been attained through the Levitical priesthood (for on this basis the people received the law), why was there still need for another priest to appear—one in the order of Melchizedek and not in the order of Aaron?

12 For when the priesthood is changed, the law must be changed as well.

13 He of whom these things are said belonged to a different tribe, from which no one has ever served at the altar.

14 For it is clear that our Lord descended from Judah, a tribe as to which Moses said nothing about priests.

Read all of Hebrews 7