Deuteronomy 18:3-5

3And this shall be the priestsdue from the people, from those offering a sacrifice, whether an ox or a sheep: athey shall give to the priest the shoulder and the two cheeks and the stomach. 4 bThe firstfruits of your grain, of your wine and of your oil, and the first fleece of your sheep, you shall give him. 5For the Lord your God has chosen him out of all your tribes cto stand and minister in the name of the Lord, him and his sons for all time.

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