Deuteronomy 15:19-23

19Set apart for the Lord your God every firstborn male of your herds and flocks. Do not put the firstborn of your cows to work, and do not shear the firstborn of your sheep.

20Each year you and your family are to eat them in the presence of the Lord your God at the place he will choose.

21If an animal has a defect, is lame or blind, or has any serious flaw, you must not sacrifice it to the Lord your God.

22You are to eat it in your own towns. Both the ceremonially unclean and the clean may eat it, as if it were gazelle or deer.

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