Deuteronomy 15:19-23

19All the firstling males that come of thy herd and of thy flock thou shalt sanctify to the LORD thy God: thou shalt do no work with the firstling of thy herd, nor shear the firstling of thy flock. 20Thou shalt eat it before the LORD thy God year by year in the place which the LORD shall choose, thou and thy household. 21And if there is any blemish in it, as if it is lame, or blind, or hath any ill blemish, thou shalt not sacrifice it to the LORD thy God. 22Thou shalt eat it within thy gates: the unclean and the clean person shall eat it alike, as the roebuck, and as the hart. 23Only thou shalt not eat its blood; thou shalt pour it upon the ground as water.