Rashi on Leviticus 7:14/רש"י על ויקרא ז׳:י״ד

1אחד מכל קרבן [AND OF IT SHALL HE OFFER] ONE OUT OF EACH OFFERING [FOR A HEAVE OFFERING UNTO THE LORD] — one bread (piece) of each of these different kinds shall he take as a heave offering for the priest who performs the rite connected with it (the קרבן), and the rest may be eaten by the owner (Menachot 77b). The flesh of the sacrifice also belongs to the owner with the exception of the breast and the shoulder of it, just as the waving of the breast and the shoulder is expressly prescribed later on, (Leviticus 7:31 Leviticus 7:32) in the case of the “peace offerings”, thus making them become the portion of the priests (cf. Leviticus 7:31 Leviticus 7:32), and the sacrifice of acknowledgement comes under the term שלמים (Zevachim 4a).