Numbers 15:17-21 - Rules For First Fruits
17 And the LORD spoke to Moses, saying, 18 Speak to the children of Israel, and say to them, When ye come into the land whither I bring you, 19 Then it shall be, that when ye eat of the bread of the land, ye shall offer up a heave-offering to the LORD. 20 Ye shall offer a cake of the first of your dough for a heave-offering: as ye do the heave-offering of the threshing-floor, so shall ye heave it. 21 Of the first of your dough ye shall give to the LORD a heave-offering in your generations.