Hebrews 7:8-12

8The priests who collect tithes are men who die, so Melchizedek is greater than they are, because we are told that he lives on.

9In addition, we might even say that these Levites—the ones who collect the tithe—paid a tithe to Melchizedek when their ancestor Abraham paid a tithe to him.

10For although Levi wasn’t born yet, the seed from which he came was in Abraham’s body when Melchizedek collected the tithe from him.

11So if the priesthood of Levi, on which the law was based, could have achieved the perfection God intended, why did God need to establish a different priesthood, with a priest in the order of Melchizedek instead of the order of Levi and Aaron?

12And if the priesthood is changed, the law must also be changed to permit it.