Numbers 18:26-29

²⁶Command thou, and announce to the deacons or Levites, When ye have taken tithes of the sons of Israel, which I gave to you, offer ye the first fruits of those or them to the Lord, that is, the tenth part of the tenth,

²⁷that it be areckoned to you into the offering of the first fruits, as well of the cornfloors, as of the presses;

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.

²⁹All things which ye shall offer of tithes, and shall separate into the gifts of the Lord, shall be the best, and all the choice things.