Hebrews 5:3

he is obliged to offer sacrifices for his own sins as well as for those of the people. besides, no man can assume

Hebrews 7:27

as those high priests of the law were, to offer up daily sacrifices, first for his own sins, and then for those of the people: having done this once for all, by offering up himself.

Hebrews 9:7

the high priest only enter'd, and that but once every year, when he carried the blood, which he offered for himself, and for the errors of 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
as those high priests of the law were, to offer up daily sacrifices, first for his own sins, and then for those of the people: having done this once for all, by offering up himself.
Hebrews 9:7
the high priest only enter'd, and that but once every year, when he carried the blood, which he offered for himself, and for the errors of the people.