Leviticus 20:25-26

²⁵So make sure you observe the difference between clean and unclean animals and birds. Don't make yourselves unclean because of any animal or bird, or by anything that runs along the ground. I have made the difference clear: they are unclean for you.

²⁶You shall be holy to me because I am holy. I am the Lord, and I have made you a distinctive people different from all other nations. You belong to me.