Leviticus 20:6

The soul that turneth after such as have familiar spirits
The man or woman that has respect unto them, seeks after them, and inquires of them, in order to get knowledge of things:

and after wizards
who pretend to tell fortunes, and discover lost and stolen goods, (See Gill on Leviticus 19:31);

to go a whoring after them;
for to consult them is to forsake the Lord, and have recourse to Satan and his instruments; to relinquish their trust in God, and put confidence in them, and attribute such things to them as only belong to God, even the knowledge of things future; and this is to commit idolatry, which is spiritual adultery:

I will even set my face against that soul;
show like resentment and indignation as at him that gives his seed to Molech:

and will cut him off from among his people;
in case his people do not bear witness against him, but hide their eyes, and wink at his crimes, or the civil magistrate does not condemn and punish him; the Targum of Jonathan is,

``I will destroy him by the pestilence.''