Leviticus 19:21

And he shall bring his trespass offering unto the Lord, unto the door of the tabernacle of the congregation, even a ram for a trespass offering.

Cross-reference

Leviticus 6:7 explains that the guilt offering brings atonement and forgiveness, fulfilling the offering's purpose here.

Leviticus 7:1 gives the legal statute for the guilt offering that this verse prescribes — the ram and its holy status.

Leviticus 5:6 specifies a female lamb for a guilt offering, differing from the ram requirement here but within the same system.