Deuteronomy 15:19-23
19“aYou shall set apart as holy to Yahweh your God all the firstborn males that are born of your herd and of your flock; you shall not work with the firstborn of your herd nor shear the firstborn of your flock. 20“aYou and your household shall eat it every year before Yahweh your God in the place which Yahweh chooses. 21“aBut if it has any defect, such as lameness or blindness, or any serious defect, you shall not sacrifice it to Yahweh your God. 22“You shall eat it within your gates; athe unclean and the clean alike may eat it, as ba gazelle or a deer. 23“Only ayou shall not eat its blood; you are to pour it out on the ground like water.