«And (of cattle slaughtered for food, He has created) eight (heads in four) pairs, the pair of sheep, the pair of goats. Say, `Is it the two males He has made unlawful, or the two females, or is it that (young) which the wombs of the two females contain (which He has forbidden)? Expound to me (the case) with (sure) knowledge if you are in the right.'»