“All the firstborn males that come from your herd and your flock you shall sanctify to the Lord your God; you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.
But the firstborn of a cow, 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 burn their fat as an offering made by fire for a sweet aroma to the Lord.
And if it is an unclean animal, then he shall redeem it according to your valuation, and shall add one-fifth to it; or if it is not redeemed, then it shall be sold according to your valuation.
because all the firstborn are Mine. On the day that I struck all the firstborn in the land of Egypt, I sanctified to Myself all the firstborn in Israel, both man and beast. They shall be Mine: I am the Lord.”
And they rose at twilight to go to the camp of the Syrians; and when they had come to the outskirts of the Syrian camp, to their surprise no one was there.
to bring the firstborn of our sons and our cattle, as it is written in the Law, and the firstborn of our herds and our flocks, to the house of our God, to the priests who minister in the house of our God;