Deuteronomy 15:19-23

19Every firstling that is born among thy kine and among thy sheep that is a male, thou shalt hallow to Jehovah thy 1God: thou shalt do no work with the firstling of thy kine, nor shear the firstling of thy sheep. 20Thou shalt eat it before Jehovah thy 2God, year by year, in the place which Jehovah will choose, thou and thy household. 21But if there be a defect therein, [if it be] lame, or blind, [or have] any evil defect, thou shalt not sacrifice it to Jehovah thy 3God. 22In thy gates shalt thou eat it; the unclean and the clean [shall eat it] alike, as the gazelle and as the hart. 23Only thou shalt not eat the blood thereof: thou shalt pour it upon the earth as water.