Hebrews 5:1

FOR, every high-priest taken from among men, is constituted on behalf of men for those services which relate to God, that he should offer both gifts and sacrifices for sins:

Hebrews 7:27

who hath not daily need, as the high-priests, first, to offer sacrifice for their own sins, afterwards, for those of the people: for this he did once for all, when he offered up himself.

Hebrews 8:3-4

For every high-priest is appointed to offer both gifts and sacrifices: wherefore it is necessary that this person also have somewhat 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
FOR, every high-priest taken from among men, is constituted on behalf of men for those services which relate to God, that he should offer both gifts and sacrifices for sins:
Hebrews 7:27
who hath not daily need, as the high-priests, first, to offer sacrifice for their own sins, afterwards, for those of the people: for this he did once for all, when he offered up himself.
Hebrews 8:3
For every high-priest is appointed to offer both gifts and sacrifices: wherefore it is necessary that this person also have somewhat to offer.