Leviticus 20:6

And the soul that turneth after such as have familiar spirits, and after wizards, to go a whoring after them, I will even set my face against that soul, and will cut him off from among his people.

The soul that turneth after such as have familiar spirits ... I will cut him off from among his people - (cf. Leviticus 20:27.) Witchcraft, being connected with idolatry, was ranked among the crimes which involved treason against Israel's king, and hence, the severity of the punishment denounced against it (see the notes on Divination, etc., Selden, 'De Diis Syris Syntagna,' cap. 1:, 20)