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? 20 To the law and to the testimony! If they do not speak according to this word, it is because there[aa] is no light in them."
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This passage warns against consulting mediums, spiritists, or anyone who "whispers and mutters" for guidance, urging people to seek God instead of the dead for the living, and to rely on God's Law and testimonies (Scripture), because those who ignore divine instruction lack true understanding ("no light") and will face darkness and distress.