Numbers 18:27-32

²⁷Your offering will be considered as if it were the firstfruits of grain from your threshing floor or grape juice from the winepress.

²⁸In this way you are to contribute an offering to the Lord from every tithe you receive from the Israelites, giving the Lord's offering to Aaron the priest.

²⁹From all the gifts you receive you are to contribute as the Lord's offering the very best, the holiest part of every gift.’

³⁰So tell the Levites, ‘When you have presented the best part, it will be considered as your contribution produced by your threshing floor or winepress.

³¹You and your families may eat it anywhere because it's compensation for your service in the Tent of Meeting.

³²You will not be considered to have sinned if you have presented the best part of it. But if you treat the sacred offerings of the Israelites with disrespect you will die.’”