Deuteronomy 15:18-22

“It shall not seem difficult for you when you set him free, because he has given you six years with double the service of a hired worker; so the Lord your God will bless you in whatever you do.

“You shall consecrate to the Lord your God all the firstborn males that are born in your herd and in your flock; you shall not work with the firstborn of your herd, nor shear the firstborn of your flock.

You and your household shall eat it every year before the Lord your God in the place which the Lord chooses.

But if it has any impairment, such as a limp, or blindness, or any serious impairment, you shall not sacrifice it to the Lord your God.

You shall eat it within your gates; the unclean and the clean alike may eat it, as a gazelle or a deer.