Numbers 18:17-19

“On the other hand, you don’t redeem a firstborn ox, sheep, or goat—they are holy. Instead splash their blood on the Altar and burn their fat as a Fire-Gift, a pleasing fragrance to GOD. But you get the meat, just as you get the breast from the Wave-Offering and the right thigh. All the holy offerings that the People of Israel set aside for GOD, I’m turning over to you and your children. That’s the standard rule and includes both you and your children—a Covenant-of-Salt, eternal and unchangeable before GOD.”