“You shall dedicate all the firstborn males that are born of your herd and of your flock to Yahweh your God. You shall do no work with the firstborn of your herd, nor shear the firstborn of your flock.”
Deuteronomy 15:19 (WEB)
Context Reading
17then you shall take an awl, and thrust it through his ear to the door, and he shall be your servant forever. Also to your female servant you shall do likewise. 18It shall not seem hard to you when you let him go free from you, for he has been double the value of a hired hand as he served you six years. Yahweh your God will bless you in all that you do. 19You shall dedicate all the firstborn males that are born of your herd and of your flock to Yahweh your God. You shall do no work with the firstborn of your herd, nor shear the firstborn of your flock. 20You shall eat it before Yahweh your God year by year in the place which Yahweh shall choose, you and your household. 21If it has any defect — is lame or blind, or has any defect whatever, you shall not sacrifice it to Yahweh your God.