Numbers 15:17 - 15:21
17 Then Yahweh spoke to Moses, saying, 18 “Speak to the sons of Israel and say to them, ‘When you enter the land where I am going to bring you, 19 then it shall be, that when you eat of the food of the land, you shall raise up a contribution offering to Yahweh. 20 Of the first of your dough you shall raise up a cake as a contribution offering; as the contribution offering of the threshing floor, so you shall raise it up. 21 From the first of your dough you shall give to Yahweh a contribution offering throughout your generations.