Deuteronomy 18:10-12a forbids communicating with the dead:
“Let no one be found among you who sacrifices their 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.”
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verses that suggest the soul may “sleep” or enter a “holding place” until Judgment Day, such as Revelation 20:11-15 and Matthew 26:31-46.