Hebrews 5:1-4

For every high priest, being taken from among men, is appointed for men in things pertaining to God, that he may offer both gifts and sacrifices for sins: who can bear gently with the ignorant and erring, for that he himself also is compassed with infirmity; and by reason thereof is bound, as for the people, so also for himself, to offer for sins. And no man taketh the honor unto himself, but when he is called of God, even as was Aaron.