Deuteronomy 18:3-5

Amplified Bible

³ “Now this shall be the priests’ portion from the people, from those offering a sacrifice, either an ox or a sheep: they shall give to the priest the shoulder and the two cheeks and the stomach. ⁴ You shall also give him the first fruits of your grain, your new wine [the first of the season], and your [olive] oil, and the first sheared fleece of your sheep. ⁵ For the Lord your God has chosen him, him and his sons from all your tribes, to stand and serve in the name of the Lord forever.