Deuteronomy 18:10-12 — There shall not be found among you anyone who makes his son or his daughter pass through the fire, or one who practices witchcraft, or a soothsayer, or one who interprets omens, or a sorcerer, or one who conjures spells, or a medium, or a spiritist, or one who calls up the dead. For all who do these things are an abomination to the Lord, and because of these abominations the Lord your God drives them out from before you.
Deuteronomy 26:14 — I have not eaten any of it when in mourning, nor have I removed any of it for an unclean use, nor given any of it for the dead. I have obeyed the voice of the Lord my God, and have done according to all that You have commanded me.
Isaiah 8:19-20 — And when they say to you, “Seek those who are mediums and wizards, who whisper and mutter,” should not a people seek their God? Should they seek the dead on behalf of the living? To the law and to the testimony! If they do not speak according to this word, it is because there is no light in them.
1 Samuel 28:7-19 — Then Saul said to his servants, “Find me a woman who is a medium, that I may go to her and inquire of her.” And his servants said to him, “In fact, there is a woman who is a medium at En Dor.” So Saul disguised himself and put on other clothes, and he went, and two men with him; and they came to the woman by night. And he said, “Please conduct a séance for me, and bring up for me the one I shall name to you.” Then the woman said to him, “Look, you know what Saul has done, how he has cut off the mediums and the spiritists from the land. Why then do you lay a snare for my life, to cause me to die?” And Saul swore to her by the Lord, saying, “As the Lord lives, no punishment shall come upon you for this thing.” Then the woman said, “Whom shall I bring up for you?” And he said, “Bring up Samuel for me.” When the woman saw Samuel, she cried out with a loud voice. And the woman spoke to Saul, saying, “Why have you deceived me? For you are Saul!” And the king said to her, “Do not be afraid. What did you see?” And the woman said to Saul, “I saw a spirit ascending out of the earth.” So he said to her, “What is his form?” And she said, “An old man is coming up, and he is covered with a mantle.” And Saul perceived that it was Samuel, and he stooped with his face to the ground and bowed down. Now Samuel said to Saul, “Why have you disturbed me by bringing me up?” And Saul answered, “I am deeply distressed; for the Philistines make war against me, and God has departed from me and does not answer me anymore, neither by prophets nor by dreams. Therefore I have called you, that you may reveal to me what I should do.” Then Samuel said: “So why do you ask me, seeing the Lord has departed from you and has become your enemy? And the Lord has done for Himself as He spoke by me. For the Lord has torn the kingdom out of your hand and given it to your neighbor, David. Because you did not obey the voice of the Lord nor execute His fierce wrath upon Amalek, therefore the Lord has done this thing to you this day. Moreover the Lord will also deliver Israel with you into the hand of the Philistines. And tomorrow you and your sons will be with me. The Lord will also deliver the army of Israel into the hand of the Philistines.”
1 Chronicles 10:13-14 — So Saul died for his unfaithfulness which he had committed against the Lord, because he did not keep the word of the Lord, and also because he consulted a medium for guidance. But he did not inquire of the Lord; therefore He killed him, and turned the kingdom over to David the son of Jesse.
Unless noted otherwise, all Scripture verses are from The New King James Version. 1996, ©1982. Nashville: Thomas Nelson.