Deuteronomy 15:19-23

19“Consecrate to the Lord your God every firstborn male produced by your herd and flock. You are not to put the firstborn of your oxen to work or shear the firstborn of your flock.

20Each year you and your family are to eat it before the Lord your God in the place the Lord chooses.

21But if there is a defect in the animal, if it is lame or blind or has any serious defect, you may not sacrifice it to the Lord your God.

22Eat it within your city gates; both the unclean person and the clean may eat it, as though it were a gazelle or deer.

23But you must not eat its blood; pour it on the ground like water.