Deuteronomy 18:2-4

New International Reader's Version

² They won’t have any part of the land the Lord gave the other tribes in Israel. The Lord himself is their share, just as he promised them.

³ Anyone who sacrifices a bull or a sheep owes a share of it to the priests. Their share is the shoulder, the inside parts and the meat from the head. ⁴ You must give the priests the first share of the harvest of your grain, olive oil and fresh wine. You must also give them the first wool you clip from your sheep.