Numbers 18:17
But the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, you shall not redeem; they are holy. You shall sprinkle their blood on the altar and shall burn their fat as a food offering, with a pleasing aroma to the LORD.
Exodus 29:16
and you shall kill the ram and shall take its blood and throw it against the sides of the altar.
Leviticus 3:2-5
And he shall lay his hand on the head of his offering and kill it at the entrance of the tent of meeting, and Aaron's sons the priests shall throw the blood against the sides of the altar.
Deuteronomy 15:19-22
"All the firstborn males that are born of your herd and flock you shall dedicate to the LORD your God. You shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.