Hebrews 7:27-28

Moffatt(i) 27 one who has no need, like yonder high priests, day by day to offer sacrifices first for their own sins and then for those of the People — he did that once for all in offering up himself. 28 For the Law appoints human beings in their weakness to the priesthood; but the word of the Oath appoints a Son who is made perfect for ever.