Numbers 18:27-28

²⁷and your heave-offering hath been reckoned to you as corn from the threshing-floor, and as fulness from the wine-vat;

²⁸so ye do lift up — ye also — the heave-offering of Jehovah from all your tithes which ye receive from the sons of Israel; and ye have given from it the heave-offering of Jehovah to Aaron the priest;