Numbers 18:24-28

ASV_Strongs(i)
  24 H4643 For the tithe H1121 of the children H3478 of Israel, H7311 which they offer H8641 as a heave-offering H3068 unto Jehovah, H5414 I have given H3881 to the Levites H5159 for an inheritance: H559 therefore I have said H8432 unto them, Among H1121 the children H3478 of Israel H5157 they shall have H5159 no inheritance.
  25 H3068 And Jehovah H1696 spake H4872 unto Moses, H559 saying,
  26 H1696 Moreover thou shalt speak H3881 unto the Levites, H559 and say H3947 unto them, When ye take H1121 of the children H3478 of Israel H4643 the tithe H5414 which I have given H5159 you from them for your inheritance, H7311 then ye shall offer H8641 up a heave-offering H3068 of it for Jehovah, H4643 a tithe H4643 of the tithe.
  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.