Leviticus 20:25-26

Ye shall therefore make a distinction between the clean beast and the unclean, and between the unclean fowl and the clean: and ye shall not make your souls abominable by beast, or by bird, or by anything wherewith the ground teemeth, which I have separated from you as unclean. And ye shall be holy unto me: for I, Jehovah, am holy, and have set you apart from the peoples, that ye should be mine.