Hebrews 5:3
And by reason hereof he ought, as for the people, so also for himself, to offer for sins.
Cross-reference
Hebrews 7:27 contrasts Jesus, who did not need to offer for his own sins, highlighting the limitation of the Levitical high priest here.
Hebrews 9:7 later echoes this: the high priest enters the holy place with blood for his own sins, showing the annual repetition of the pattern.
Leviticus 4:3-12 provides the specific law: if the anointed priest sins, he must offer a bull for his own sin, confirming the obligation in Hebrews 5:3.
Leviticus 9:7 records Moses instructing Aaron to offer a sin offering for himself first, directly illustrating the obligation stated here.
Leviticus 16:6 specifies the Day of Atonement bull for Aaron and his household, the annual fulfillment of this duty to offer for his own sins.
Leviticus 16:15 shows the second stage: the goat for the people, distinguishing the priest's own offering from the people's, as in Hebrews 5:3.
Leviticus 9:2 commands Aaron to bring a sin offering for himself, the initial step before ministering, echoing the priest's obligation.
Exodus 29:12-19 describes the sin offering during Aaron's consecration, establishing the pattern of offering for the priest's own atonement.
Leviticus 8:14-21 details the sin offering at Aaron's ordination, again requiring the priest to atone for himself before serving.