It shall be for Aaron and his sons as a perpetual statute from the sons of Israel, for it is a contribution offering; and it shall be a contribution offering from the sons of Israel from the sacrifices of their peace offerings, even their contribution offering to Yahweh.
So you shall also raise up a contribution offering to Yahweh from all your tithes, which you receive from the sons of Israel; and from it you shall give the contribution offering of Yahweh to Aaron the priest.
And you shall say to them, ‘When you have raised up from it the best of it, then the rest shall be accounted to the Levites as the product of the threshing floor and as the product of the wine vat.