Leviticus 5:18
And he shall bring a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: and the priest shall make an atonement for him concerning his ignorance wherein he erred and wist it not, and it shall be forgiven him.
Cross-reference
Leviticus 5:15 describes a guilt offering for sins against holy things. Both prescribe a ram for unintentional sin.
Leviticus 4:20 describes the sin offering's atonement and forgiveness — the guilt offering here functions similarly for specific offenses.
Leviticus 6:7 concludes the guilt offering with forgiveness — here the offense is against holy things rather than a neighbor.
Leviticus 6:6 also mandates a guilt offering with a ram, for deception. Both are guilt offering laws.
Leviticus 1:4 establishes atonement through laying on hands — the guilt offering here uses a different sacrifice but achieves the same atonement.
Leviticus 14:12 also prescribes a guilt offering — here used for leprosy purification, showing its broader application.
Hebrews 9:22 states that blood is required for remission — the guilt offering here embodies that principle.