Deuteronomy 18:3-4

KJ2000(i) 3 And this shall be the priest's due from the people, from them that offer a sacrifice, whether it be ox or sheep; and they shall give unto the priest the shoulder, and the two jowls, and the stomach. 4 The firstfruit also of your grain, of your wine, and of your oil, and the first of the fleece of your sheep, shall you give him.