Numbers 18:12-18

I am giving you all the best of the fresh oil, new wine, and grain,  which the Israelites give to the LORD as their firstfruits.  The firstfruits of all that is in their land, which they bring to the LORD, belong to you. Every clean person in your house may eat them. “Everything in Israel that is permanently dedicated to the LORD   belongs to you. The firstborn of every living thing, human or animal, presented to the LORD belongs to you. But you must certainly redeem a human firstborn,  and redeem the firstborn of an unclean animal. You will pay the redemption price for a month-old male according to your assessment: five shekels  of silver by the standard sanctuary shekel, which is twenty gerahs.  “However, you must not redeem the firstborn of an ox, a sheep, or a goat; they are holy. You are to splatter their blood on the altar and burn their fat as a food offering for a pleasing aroma to the LORD. But their meat belongs to you. It belongs to you like the breast of the presentation offering and the right thigh.