Hebrews 7:11-12

ERV(i) 11 Now if there was perfection through the Levitical priesthood (for under it hath the people received the law), what further need [was there] that another priest should arise after the order of Melchizedek, and not be reckoned after the order of Aaron? 12 For the priesthood being changed, there is made of necessity a change also of the law.