Numbers 15:17-21 - Rules For First Fruits
17 And LORD spoke to Moses, saying, 18 Speak to the sons of Israel, and say to them, When ye come into the land where 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 LORD. 20 Of the first of your dough ye shall offer up a cake for a heave-offering, as the heave-offering of the threshing-floor, so shall ye heave it. 21 Of the first of your dough ye shall give to LORD a heave-offering throughout your generations.