Adam Clarke on 1 Samuel 1:4

He gave - portions - The sacrifices which were made were probably peace-offerings, of which the blood was poured out at the foot of the altar; the fat was burnt on the fire; the breast and right shoulder were the portion of the priest, and the rest belonged to him who made the offering; on it he and his family feasted, each receiving his portion; and to these feasts God commands them to invite the Levite, the poor, the widow, and the orphan, Deu 16:11.