Numbers 15:17-21 - Rules For First Fruits
17 The LORD spoke to Moses, saying, 18 "Speak to the people of Israel and say to them, When you come into the land to which I bring you 19 and when you eat of the bread of the land, you shall present a contribution to the LORD. 20 Of the first of your dough you shall present a loaf as a contribution; like a contribution from the threshing floor, so shall you present it. 21 Some of the first of your dough you shall give to the LORD as a contribution throughout your generations.