Hebrews 7:11-12 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?

MSB⁽ⁱ⁾ 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.