Numbers 18:17-19

Amplified Bible, Classic Edition

¹⁷ But the firstling of a cow or of a sheep or of a goat you shall not redeem. They [as the firstborn of clean beasts belong to God and] are holy. You shall sprinkle their blood upon the altar and shall burn their fat for an offering made by fire, for a sweet and soothing odor to the Lord.

¹⁸ And the flesh of them shall be yours, as the wave breast and as the right shoulder are yours.

¹⁹ All the heave offerings [the lifted-out and kept portions] of the holy things which the Israelites give to the Lord I give to you and to your sons and your daughters with you, as a continual debt forever. It is a covenant of salt [that cannot be dissolved or violated] forever before the Lord for you [Aaron] and for your posterity with you.