Charles Ellicott Commentary Leviticus 22:29

"And when ye sacrifice a sacrifice of thanksgiving unto Jehovah, ye shall sacrifice it that ye may be accepted." — Leviticus 22:29 (ASV)

Offer it at your own will. —Better, offer it for your acceptance. (See Leviticus 22:19.) That is, offer it in such a manner that it should be accepted. (For this kind of offering, see Leviticus 7:15-16.)