Numbers 18:17

Revised Standard Version

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;

Cross References

Exodus 29:16

and you shall slaughter the ram, and shall take its blood and throw it against the altar round about.

Leviticus 17:6

and the priest shall sprinkle the blood on the altar of the Lord at the door of the tent of meeting, and burn the fat for a pleasing odor to the Lord.

Numbers 18:16

And their redemption price (at a month old you shall redeem them) you shall fix at five shekels in silver, according to the shekel of the sanctuary, which is twenty gerahs.