Leviticus 20:5-8

⁵then I will set My face against that man, and against his family, and will cut him off, and all that go astray after him, to go astray after Molech, from among their people.

⁶And the soul that turneth unto the ghosts, and unto the familiar spirits, to go astray after them, I will even set My face against that soul, and will cut him off from among his people.

⁷Sanctify yourselves therefore, and be ye holy; for I am the LORD your God.

⁸And keep ye My statutes, and do them: I am the LORD who sanctify you.