Moses
Leviticus 4:18ESV·traditional attribution

And he shall put some of the blood on the horns of the altar that is in the tent of meeting before the LORD, and the rest of the blood he shall pour out at the base of the altar of burnt offering that is at the entrance of the tent of meeting.

Matthew Henry Presbyterian @wholebiblehenry

This is the law for expiating the guilt of a national sin, by a sin offering. If the leaders of the people, through mistake concerning the law, caused them to err, when the mistake was discovered an offering must be brought, that wrath might not come upon the whole congregation. Observe, 1. It is possible that the church may err, and that her guides may mislead her.

Commenting on Leviticus 4:13-21

Jamieson-Fausset-Brown Reformed @jfbcommentary

SIN OFFERING FOR THE PRIEST. (Lev. 4:3-35) If the priest that is anointed do sin--that is, the high priest, in whom, considering his character as typical mediator, and his exalted office, the people had the deepest interest; and whose transgression of any part of the divine law, therefore, whether done unconsciously or heedlessly, was a very serious offense, both as regarded himself individually, and the influence of his example.

Commenting on Leviticus 4:3-35

Keil & Delitzsch Lutheran @keilanddelitzsch

Lev 4:13-19 Sin of the whole congregation. - This is still further defined, as consisting in the fact that the thing was hid (נעלּם) from the eyes of the congregation, i.e., that it was a sin which was not known to be such, an act which really violated a commandment of God, though it was not looked upon as sin.

Commenting on Leviticus 4:13-19