Hebrews 7:11; Hebrews 7:12

Hebrews 7:11

11 If perfection could have been attained through the Levitical priesthood—and indeed the law given to the people established that priesthood—why was there still need for another priest to come, one in the order of Melchizedek, not in the order of Aaron?

Hebrews 7:12

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