Unless otherwise noted, all references are from the 1984 New International Version
Leviticus 19:31 — "Do not turn to mediums or seek out spiritists, for you will be defiled by them. I am the LORD your God."
Leviticus 20:6 — "I will set my face against the person who turns to mediums and spiritists to prostitute himself by following them, and I will cut him off from his people."
Deuteronomy 18:9-14 — "When you enter the land the LORD your God is giving you, do not learn to imitate the detestable ways of the nations there. Let no one be found among you who sacrifices his son or daughter in the fire, who practices divination or sorcery, interprets omens, engages in witchcraft, or casts spells, or who is a medium or spiritist or who consults the dead. Anyone who does these things is detestable to the LORD, and because of these detestable practices the LORD your God will drive out those nations before you. You must be blameless before the LORD your God. The nations you will dispossess listen to those who practice sorcery or divination. But as for you, the LORD your God has not permitted you to do so."
1 Samuel 28:7 (NASB) — "Then Saul said to his servants, "Seek for me a woman who is a medium, that I may go to her and inquire of her." And his servants said to him, "Behold, there is a woman who is a medium at Endor."" [Note: This is a long account about King Saul of Israel when he consulted a woman who was a medium because God had forsaken him and no longer answered him. He did what he knew was forbidden. There's more to this story which you can read in context.]
2 Kings 17:16-17 — "They forsook all the commands of the LORD their God and made for themselves two idols cast in the shape of calves, and an Asherah pole. They bowed down to all the starry hosts, and they worshiped Baal. They sacrificed their sons and daughters in the fire. They practiced divination and sorcery and sold themselves to do evil in the eyes of the LORD, provoking him to anger."
2 Chronicles 33:1-6 — "Manasseh was twelve years old when he became king, and he reigned in Jerusalem fifty-five years. He did evil in the eyes of the LORD, following the detestable practices of the nations the LORD had driven out before the Israelites. He rebuilt the high places his father Hezekiah had demolished; he also erected altars to the Baals and made Asherah poles. He bowed down to all the starry hosts and worshiped them. He built altars in the temple of the LORD, of which the LORD had said, "My Name will remain in Jerusalem forever." In both courts of the temple of the LORD, he built altars to all the starry hosts. He sacrificed his sons in the fire in the Valley of Ben Hinnom, practiced sorcery, divination and witchcraft, and consulted mediums and spiritists. He did much evil in the eyes of the LORD, provoking him to anger."
Job 31:26-28 — "...if I have regarded the sun in its radiance or the moon moving in splendor, so that my heart was secretly enticed and my hand offered them a kiss of homage, then these also would be sins to be judged, for I would have been unfaithful to God on high."
Isaiah 8:19-20 — "When men tell you to consult mediums and spiritists, who whisper and mutter, should not a people inquire of their God? Why consult the dead on behalf of the living? To the law and to the testimony! If they do not speak according to this word, they have no light of dawn."
Isaiah 47:12-13 — "Keep on, then, with your magic spells and with your many sorceries, which you have labored at since childhood. Perhaps you will succeed, perhaps you will cause terror. All the counsel you have received has only worn you out!"
Jeremiah 8:2 — "They will be exposed to the sun and the moon and all the stars of the heavens, which they have loved and served and which they have followed and consulted and worshiped. They will not be gathered up or buried, but will be like refuse lying on the ground."
Ezekiel 8:16-18 — "He then brought me into the inner court of the house of the LORD, and there at the entrance to the temple, between the portico and the altar, were about twenty-five men. With their backs toward the temple of the LORD and their faces toward the east, they were bowing down to the sun in the east. He said to me, "Have you seen this, son of man? Is it a trivial matter for the house of Judah to do the detestable things they are doing here? Must they also fill the land with violence and continually provoke me to anger? Look at them putting the branch to their nose! Therefore I will deal with them in anger; I will not look on them with pity or spare them. Although they shout in my ears, I will not listen to them.’"
Daniel 2:27-28 — "No wise man, enchanter, magician or diviner can explain to the king the mystery he has asked about, but there is a God in heaven who reveals mysteries."
Micah 5:12 — "I will destroy your witchcraft and you will no longer cast spells."
Zephaniah 1:4-6 — "I will stretch out my hand against Judah and against all who live in Jerusalem. I will cut off from this place every remnant of Baal, the names of the pagan and the idolatrous priests–those who bow down on the roofs to worship the starry host, those who bow down and swear by the LORD and who also swear by Molech, those who turn back from following the LORD and neither seek the LORD nor inquire of him."
Acts 7:42 — "But God turned away and gave them over to the worship of the heavenly bodies. This agrees with what is written in the book of the prophets: "Did you bring me sacrifices and offerings forty years in the desert, O house of Israel? You have lifted up the shrine of Molech and the star of your god Rephan, the idols you made to worship. Therefore I will send you into exile beyond Babylon.""
Acts 16:16-19 — "Once when we were going to the place of prayer, we were met by a slave girl who had a spirit by which she predicted the future. She earned a great deal of money for her owners by fortune-telling. This girl followed Paul and the rest of us, shouting, "These men are servants of the Most High God, who are telling you the way to be saved." She kept this up for many days. Finally Paul became so troubled that he turned around and said to the spirit, "In the name of Jesus Christ I command you to come out of her!" At that moment the spirit left her. When the owners of the slave girl realized that their hope of making money was gone, they seized Paul and Silas and dragged them into the marketplace to face the authorities."
Acts 19:18-19 — "Many of those who believed now came and openly confessed their evil deeds. A number who had practiced sorcery brought their scrolls together and burned them publicly. When they calculated the value of the scrolls, the total came to fifty thousand drachmas."
Romans 1:25 — "They exchanged the truth of God for a lie, and worshiped and served created things rather than the Creator—who is forever praised. Amen."
1 Timothy 1:3-4 — "Command certain men not to teach false doctrines any longer nor to devote themselves to myths and endless genealogies. These promote controversies rather than God’s work—which is by faith."
1 Timothy 4:7 — "Have nothing to do with godless myths and old wives' tales; rather, train yourselves to be godly."
Revelation 9:20-21 — "They did not stop worshiping demons, and idols of gold, silver, bronze, stone and wood—idols that cannot see or hear or walk. Nor did they repent of their murders, their magic arts, their sexual immorality or their thefts."
Revelation 22:15 — "Outside are the dogs, those who practice magic arts, the sexually immoral, the murderers, the idolaters and everyone who loves and practices falsehood."