Leviticus 20:25-26

20:25 Therefore you must distinguish between the clean animal and the unclean, and between the unclean bird and the clean, and you must not make yourselves detestable by means of an animal or bird or anything that creeps on the ground – creatures I have distinguished for you as unclean. 20:26 You must be holy to me because I, the Lord, am holy, and I have set you apart from the other peoples to be mine.