Albert Barnes Commentary Leviticus 7:14

"And of it he shall offer one out of each oblation for a heave-offering unto Jehovah; it shall be the priest`s that sprinkleth the blood of the peace-offerings." — Leviticus 7:14 (ASV)

Out of the whole oblation - Rather, out of each offering. That is, one loaf or cake out of each kind of meat-offering was to be a heave-offering (Leviticus 7:32) for the officiating priest. According to Jewish tradition, there were to be ten cakes of each kind of bread in every thank-offering. The other cakes were returned to the sacrificer.