Albert Barnes Commentary Leviticus 3:1

"And if his oblation be a sacrifice of peace-offerings; if he offer of the herd, whether male or female, he shall offer it without blemish before Jehovah." — Leviticus 3:1 (ASV)

The peace-offering (like the burnt-offering (Leviticus 1:3) and the Minchah (Leviticus 2:1)) is here spoken of as if it was familiarly known before the giving of the Law. "Peace-offering" seems preferable to "thank-offering," which occurs in several places in the margin of our Bible. "thank-offering" appears to be the right name for a subordinate class of peace-offering.