Deuteronomy 15:19-23 - Consecration Of Firstborn Animals
19 "Set apart for the LORD your God every firstborn male among your herd and flock. You must not put the firstborn of your ox to work or shear the firstborn of your flock. 20 Then in the presence of the LORD your God, you and your household must eat them every year at the place the LORD will choose. 21 If it has a blemish lameness, blindness, or any kind of defect you must not sacrifice it to the LORD your God. 22 In your cities both the unclean and the clean together are to eat together, as the gazelle and the deer. 23 Only you must not eat its blood. Pour it on the ground like water."