Hebrews 5:3

3. By reason hereof That, is, of this infirmity.

He ought… for himself to offer Although these susceptibilities are not in themselves sins, yet so sure is the presumption that even the high priest has in course of the year incurred guilt that he needs to offer, also, for himself. Herein the true High Priest surpasses the Aaronic line, in that he is without sin, (Hebrews 4:15,) and needs not atonement.