Numbers 18:27-28

²⁷that it be areckoned to you into the offering of the first fruits, as well of the cornfloors, as of the presses; (so that it shall be counted for you as though it be an offering of the first fruits, yea, from the threshing floor, and from the winepress;)

²⁸and of all things of which ye take tithes, offer ye the first fruits to the Lord, and give ye those to Aaron, the priest.