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