Leviticus 6:6
And he shall bring his trespass offering unto the Lord, a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest:
Cross-references
Leviticus 5:15 also prescribes a ram without blemish for a guilt offering — identical ritual for unintentional sins against holy things.
Leviticus 5:18 likewise requires a ram without blemish as a guilt offering — another parallel case for unintentional sin.
Isaiah 53:10 speaks of the Messiah's soul making a guilt offering — the ram here prefigures Christ's atoning sacrifice for sin.
Isaiah 53:11 says the servant will bear their iniquities — the guilt offering's purpose of bearing sin is fulfilled in Christ.
Ezra 10:19 records the post-exile offering of a ram for trespass, directly matching this requirement for guilt offerings.
Numbers 5:8 describes the same ram of atonement for trespass when there is no kinsman, expanding the application of this offering.