Leviticus 20:6

"'If any soul turn him to enchanters or expounders of tokens and go a whoring after them, I will put my face upon that soul and will destroy him from among his people.

Leviticus 19:31

Turn not to them that work with spirits, neither regard them that observe dismal days, that ye be not defiled by them: for I am the LORD your God.

Leviticus 20:27

"'If there be man or woman that worketh with a spirit or a maker of dismal days, they shall die for it. Men shall stone them with stones, and their blood shall be upon them.'"

Isaiah 8:19

And therefore if they say unto you, "Ask counsel at the soothsayers, witches, charmers and conjurers," then make them this answer: "Is there a people anywhere, that asketh not counsel at his God? Should they run unto the dead for the living?"

Exodus 34:15-16

lest, if thou make any covenant with the inhabiters of the land, when they go a whoring after their gods and do sacrifice unto their gods, they call thee and thou eat of their sacrifice;

Leviticus 19:26

"'Ye shall eat nothing with the blood, ye shall use no witchcraft, nor observe dismal days.

Numbers 15:39

And the guard shall be unto you to look upon it, that ye remember all the commandments of the LORD and do them: that ye seek not a way after your own hearts and after your own eyes, for to go a whoring after them:

Deuteronomy 18:10-14

Let there not be found among you that maketh his son or his daughter go through fire, either a bruterer or a maker of dismal days, or that useth witchcraft, or a sorcerer,

1 Chronicles 10:13-14

And so Saul died for his trespass that he trespassed against the LORD, in that he kept not the word of the LORD, and in that he asked counsel of a woman that wrought with a spirit,

Psalm 73:27

For lo, they that forsake thee shall perish; thou destroyest all them that commit fornication against thee.

Ezekiel 6:9

And they that escape from you, shall think upon me among the Heathen, where they shall be in captivity. As for that whorish and unfaithful heart of theirs, wherewith they run away from me, I will break it: Yea, and put out those eyes of theirs, that committed fornication with their idols. Then shall they be ashamed, and displeased with their selves, for the wickedness and abominations, which they have done:

Hosea 4:12

My people ask counsel at their stocks, their staff must tell them. For a whorish mind hath deceived them, so that they commit fornication against their God.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Familiar

Leviticus 20:27
"'If there be man or woman that worketh with a spirit or a maker of dismal days, they shall die for it. Men shall stone them with stones, and their blood shall be upon them.'"
Leviticus 19:26
"'Ye shall eat nothing with the blood, ye shall use no witchcraft, nor observe dismal days.
Deuteronomy 18:10
Let there not be found among you that maketh his son or his daughter go through fire, either a bruterer or a maker of dismal days, or that useth witchcraft, or a sorcerer,
Isaiah 8:19
And therefore if they say unto you, "Ask counsel at the soothsayers, witches, charmers and conjurers," then make them this answer: "Is there a people anywhere, that asketh not counsel at his God? Should they run unto the dead for the living?"

Go

Exodus 34:15
lest, if thou make any covenant with the inhabiters of the land, when they go a whoring after their gods and do sacrifice unto their gods, they call thee and thou eat of their sacrifice;
Numbers 15:39
And the guard shall be unto you to look upon it, that ye remember all the commandments of the LORD and do them: that ye seek not a way after your own hearts and after your own eyes, for to go a whoring after them:
Psalm 73:27
For lo, they that forsake thee shall perish; thou destroyest all them that commit fornication against thee.
Ezekiel 6:9
And they that escape from you, shall think upon me among the Heathen, where they shall be in captivity. As for that whorish and unfaithful heart of theirs, wherewith they run away from me, I will break it: Yea, and put out those eyes of theirs, that committed fornication with their idols. Then shall they be ashamed, and displeased with their selves, for the wickedness and abominations, which they have done:
Hosea 4:12
My people ask counsel at their stocks, their staff must tell them. For a whorish mind hath deceived them, so that they commit fornication against their God.

General references

Exodus 22:18
"Thou shalt not suffer a witch to live.
Leviticus 18:29
For whosoever shall commit any of these abominations, the same souls that commit them shall perish from among their people.
Leviticus 19:31
Turn not to them that work with spirits, neither regard them that observe dismal days, that ye be not defiled by them: for I am the LORD your God.
Leviticus 23:30
And whatsoever soul do any manner work that day, the same I will destroy from among his people.