Numbers 18:11

18:11 “And this is yours: the raised offering of their gift, along with all the wave offerings of the Israelites. I have given them to you and to your sons and daughters with you as a perpetual ordinance. Everyone who is ceremonially clean in your household may eat of it.

Numbers 18:17

18:17 But you must not redeem the firstborn of a cow or a sheep or a goat; they are holy. You must splash ¹  their blood on the altar and burn their fat for an offering made by fire for a pleasing aroma to the Lord.

[18:17]  ¹ tn Or “throw, toss.”