“Yahweh spoke to Moses. ‘Speak to the Israelites and say to them. After you come into the land to which I am bringing you, whenever you eat of the bread of the land, you shall present a donation to Yahweh. From your first batch of dough you shall present a loaf as a donation. You shall present it just as you present a donation from the threshing floor. Throughout your generations you shall give to Yahweh a donation from the first of your batch of dough.”
Once again it is God speaking to Moses about what they are to do when they come into the Promised Land. From their first batch of dough they shall present a loaf as a donation. The first batch of dough belongs to Yahweh. This is in line with the idea of the first-born belongs to Yahweh. So too, the first bread belongs to Yahweh.
Eugene Finnegan Bible Project 