Leviticus 20:25-26

25And ye shall make a separation between the clean beast and the unclean, and between the unclean fowl and the clean, and ye shall not make yourselves an abomination by beast, or by fowl, or by anything that creepeth on the ground which I have separated for you, declaring [it] as unclean.

26And ye shall be holy unto me; for I Jehovah am holy, and have separated you from the peoples to be mine.