Numbers 18:27-30

ASV_Strongs(i)
  27 H8641 And your heave-offering H2803 shall be reckoned H1715 unto you, as though it were the grain H1637 of the threshing-floor, H4395 and as the fulness H3342 of the winepress.
  28 H7311 Thus ye also shall offer H8641 a heave-offering H3068 unto Jehovah H4643 of all your tithes, H3947 which ye receive H1121 of the children H3478 of Israel; H5414 and thereof ye shall give H3068 Jehovah's H8641 heave-offering H175 to Aaron H3548 the priest.
  29 H4979 Out of all your gifts H7311 ye shall offer H8641 every heave-offering H3068 of Jehovah, H2459 of all the best H4720 thereof, even the hallowed part thereof out of it.
  30 H559 Therefore thou shalt say H7311 unto them, When ye heave H2459 the best H2803 thereof from it, then it shall be reckoned H3881 unto the Levites H8393 as the increase H1637 of the threshing-floor, H8393 and as the increase H3342 of the wine-press.