Numbers 15:17-21
17Then 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, 19then it shall be, that when you eat of the 1,afood of the land, you shall 2raise up 3a contribution offering to Yahweh. 20‘aOf the first of your 1dough you shall 2raise up a cake as a 3contribution offering; as bthe 4contribution offering of the threshing floor, so you shall raise it up. 21‘From the first of your 1dough you shall give to Yahweh a 2contribution offering throughout your generations.