Deuteronomy 18:3-5

The Voice

This is a special arrangement between God and the Levites; He’ll provide for them and give them their distinct identity so they can focus on serving Him instead of serving their families.

³Whenever someone sacrifices an ox or a sheep, the priests are entitled to these portions: one shank (a thigh and shoulder), the cheeks (those tender delicacies), and the fourth compartment of the stomach so they can have rennet to make cheese curds. ⁴You must also give the priests the first grain, wine, and olive oil you produce each year, and the first wool you shear from your sheep ⁵because the Eternal your God chose Levi and his descendants, out of all of your tribes, to stand in His presence and to serve in His name at all times.