Numbers 18:27-32

²⁷Your wave offering shall be credited to you, as though it were the grain of the threshing floor, and as the fullness of the wine press.

²⁸Thus you also shall offer a wave offering to the LORD of all your tithes, which you receive of the children of Israel; and of it you shall give the LORD’s wave offering to Aaron the priest.

²⁹Out of all your gifts, you shall offer every wave offering to the LORD, of all its best parts, even the holy part of it.’

³⁰“Therefore you shall tell them, ‘When you heave its best from it, then it shall be credited to the Levites as the increase of the threshing floor, and as the increase of the wine press.

³¹You may eat it anywhere, you and your households, for it is your reward in return for your service in the Tent of Meeting.

³²You shall bear no sin by reason of it, when you have heaved from it its best. You shall not profane the holy things of the children of Israel, that you not die.’”