Leviticus 20:25-26

²⁵You must therefore distinguish between the clean animals and the unclean, and between the unclean birds and the clean. You must not defile yourselves with unclean animals or birds or with any creature that crawls along the ground, which I have separated as unclean from you.

²⁶You must be holy, for I, Yahweh, am holy, and I have separated you from the other peoples, for you belong to me.