Isaiah 8:16-20 - Warning Against Consulting The Dead
16 Bind thou up the testimony. Seal the law among my disciples. 17 And I will wait for LORD, who hides his face from the house of Jacob, and I will {be a man who has trusted (LXX/NT)} in him.
18 Behold, I and the children whom LORD has given me are for signs and for wonders in Israel from LORD of hosts, who dwells in mount Zion. 19 And when they shall say to you, Seek for those who have familiar spirits and for the wizards, who chirp and who mutter, should not a people seek for their God? On behalf of the living [seek] to the dead? 20 [Seek] to the law and to the testimony! If they speak not according to this word, surely there is no morning for them.