So you shall also present a contribution to the LORD from all your tithes, which you receive from the people of Israel. And from it you shall give the LORD's contribution to Aaron the priest.
Therefore you shall say to them, 'When you have offered from it the best of it, then the rest shall be counted to the Levites as produce of the threshing floor, and as produce of the winepress.
It shall be for Aaron and his sons as a perpetual due from the people of Israel, for it is a contribution. It shall be a contribution from the people of Israel from their peace offerings, their contribution to the LORD.