Hebrews 5:1

For every high priest, being received from men, presides over men in the things appertaining to God, in order that he may offer gifts and sacrifices for sins:

Hebrews 7:27

who had not daily need, as the high priests, first to offer up sacrifices for their own sins, then those of the people: for he did this, having offered up himself once.

Hebrews 8:3-4

For every high priest is appointed to offer both gifts and sacrifices: whence it is necessary to have something even that which he may 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, being received from men, presides over men in the things appertaining to God, in order that he may offer gifts and sacrifices for sins:
Hebrews 7:27
who had not daily need, as the high priests, first to offer up sacrifices for their own sins, then those of the people: for he did this, having offered up himself once.
Hebrews 8:3
For every high priest is appointed to offer both gifts and sacrifices: whence it is necessary to have something even that which he may offer.