Numbers 18:17-19

Revised Standard Version

¹⁷ But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, you shall not redeem; they are holy. You shall sprinkle their blood upon the altar, and shall burn their fat as an offering by fire, a pleasing odor to the Lord; ¹⁸ but their flesh shall be yours, as the breast that is waved and as the right thigh are yours. ¹⁹ All the holy offerings which the people of Israel present to the Lord I give to you, and to your sons and daughters with you, as a perpetual due; it is a covenant of salt for ever before the Lord for you and for your offspring with you.”