Hebrews 7:11; Hebrews 8:6

11 Now if perfection was through the Levitical priesthood (for on the basis of it the people received the Law ), what further need was there for another priest to arise according to the order of Melchizedek, and not be designated according to the order of Aaron?

6 But now He has obtained a more excellent ministry, by as much as He is also the mediator of a better covenant, which has been enacted on better promises.