1 Samuel 2:13-14

131And this was the custom of the priests with the people: when anyone was offering a sacrifice, the priest’s servant would come while the meat was cooking, with a three-pronged fork in his hand.

14And he would thrust it into the pan, or kettle, or caldron, or pot; everything that the fork brought up, the priest would take for himself. They did so in Shiloh to all the Israelites who came there.