Hebrews 5:1

Every high priest who is selected from men and appointed to act on behalf of men in things divine, offering gifts and sacrifices for sins,

Hebrews 7:27

one who has no need, like yonder high priests, day by day to offer sacrifices first for their own sins and then for those of the People ??he did that once for all in offering up himself.

Hebrews 8:3-4

Now, as every high priest is appointed to offer gifts and sacrifices, he too must have something to offer.

Treasury of Scripture Knowledge

Summary

This is the offering of Aaron and of his sons, which they shall offer unto the LORD in the day when he is anointed; the tenth part of an ephah of fine flour for a meat offering perpetual, half of it in the morning, and half thereof at night.

Bible References

The offering

Hebrews 5:1
Every high priest who is selected from men and appointed to act on behalf of men in things divine, offering gifts and sacrifices for sins,
Hebrews 7:27
one who has no need, like yonder high priests, day by day to offer sacrifices first for their own sins and then for those of the People ??he did that once for all in offering up himself.
Hebrews 8:3
Now, as every high priest is appointed to offer gifts and sacrifices, he too must have something to offer.