and it shall be for Aaron and his sons as a due for ever from the children of Israel: for it is an heave offering: and it shall be an heave offering from the children of Israel of the sacrifices of their peace offerings, even their heave offering unto the LORD.
Thus ye also shall offer an heave offering unto the LORD of all your tithes, which ye receive of the children of Israel; and thereof ye shall give the LORD'S heave offering to Aaron the priest.
Therefore thou shalt say unto them, When ye heave the best thereof from it, then it shall be counted unto the Levites as the increase of the threshing-floor, and as the increase of the winepress.