Deuteronomy 15:19-23 - Consecration Of Firstborn Animals
19 All the firstborn males that are born of your herd and of your flock you shall sanctify to the LORD your God: you shall do no work with the firstborn of your herd, nor shear the firstborn of your flock. 20 You shall eat it before the LORD your God year by year in the place which the LORD shall choose, you and your household. 21 If it has any blemish, is lame or blind, or has any defect whatever, you shall not sacrifice it to the LORD your God. 22 You shall eat it within your gates: the unclean and the clean shall eat it alike, as the gazelle, and as the hart. 23 Only you shall not eat its blood; you shall pour it out on the ground as water.