Charles Ellicott Commentary Leviticus 7:11

"And this is the law of the sacrifice of peace-offerings, which one shall offer unto Jehovah." — Leviticus 7:11 (ASV)

And this is the law of the sacrifice of peace offerings. —This means the rites to be observed in connection with this sacrifice. As in the case of the sin offering (Leviticus 4:24–31 with Leviticus 6:24-30) and the trespass offering (Leviticus 5:1–13 with Leviticus 7:1-10), so here (Leviticus 7:11–21), we have more specific and fuller directions given to the priests with regard to the peace offerings, about which orders had previously been given to the people (Leviticus 3:1–15).

Which he shall offer. —This means, he who feels it his duty to offer it to the Lord. This common Hebrew idiom of using a verb with he in it without an antecedent is better expressed in English by the impersonal, which one shall offer, or by the passive, which shall be offered. (See Leviticus 7:20-29.) Three classes of peace offerings are specified—

1. An acknowledgment of mercies received.
2. As a vow offering.
3. As a freewill offering.