Question: where in the bible it talks about unclean?
Answer: Bible Gateway Leviticus 11 :: NIV. You may eat any animal that has a split hoof completely divided and that chews the cud. "`There are some that only chew the cud or only have a split hoof, but you must not eat them. The camel, though it chews the cud, does not have a split hoof; it is ceremonially unclean for you.