Charles Ellicott Commentary Hebrews 5:3

"and by reason thereof is bound, as for the people, so also for himself, to offer for sins." — Hebrews 5:3 (ASV)

This is closely joined with Hebrews 5:2: Is compassed with infirmity, and by reason thereof is bound... The law of the Day of Atonement required a sin-offering of a bullock and a burnt-offering of a ram for the high priest himself, and for the congregation a sin-offering of two he-goats and a burnt-offering of a ram. Over his own sin-offering the high priest made confession of sins, first for himself and his household, then for the priests; over the goat sent into the wilderness the sins of the people were confessed.