Hebrews 5:3

and so is obliged to offer sin-offerings, not only for the people but for himself as well.

Hebrews 7:27

who does not need, as did the Levitical priests, to offer sacrifices, first for his own sins and then for those of the people; this latter is just what He did once for all when He offered up Himself.

Hebrews 9:7

but into the second or inner part nobody but the high priest may go, and he only once a year, and never without blood which he offers for himself and for the sins committed in ignorance by the people.

Treasury of Scripture Knowledge

Summary

And by reason hereof he ought, as for the people, so also for himself, to offer for sins.

Bible References

As

Hebrews 7:27
who does not need, as did the Levitical priests, to offer sacrifices, first for his own sins and then for those of the people; this latter is just what He did once for all when He offered up Himself.
Hebrews 9:7
but into the second or inner part nobody but the high priest may go, and he only once a year, and never without blood which he offers for himself and for the sins committed in ignorance by the people.