Deuteronomy 15:19-23

19“You shall consecrate (set apart) to the Lord your God all the firstborn males that are born of your herd and flock. You shall not work with the firstborn of your herd, nor shear the firstborn of your flock.

20You and your household shall eat it every year before the Lord your God in the place [for worship] which the Lord chooses.

21But if it has any defect or injury, such as lameness or blindness, or any serious defect, you shall not sacrifice it to the Lord your God.

22You shall eat it within your [city] gates; the [ceremonially] unclean and the clean alike may eat it, as [if it were] a gazelle or a deer.

23Only you shall not eat its blood; you are to pour it out on the ground like water.