isaiah 8:19 And when they shall say unto you, Seek unto them that have familiar spirits, and unto wizards that peep, and that mutter: should not a people seek unto their God? for the living to the dead? - Free Bible Online

      19. Seek unto--Consult in your national difficulties.
      them . . . familiar spirits--necromancers, spirit charmers. So Saul, when he had forsaken God (1Sa 28:7, &c.), consulted the witch of En-dor in his difficulties. These follow in the wake of idolatry, which prevailed under Ahaz (2Ki 16:3, 4, 10). He copied the soothsaying as he did the idolatrous "altar" of Damascus (compare Le 20:6, which forbids it, Isa 19:3).
      wizards--men claiming supernatural knowledge; from the old English, "to wit," that is, know.
      peep--rather "chirp faintly," as young birds do; this sound was generally ascribed to departed spirits; by ventriloquism the soothsayers caused a low sound to proceed as from a grave, or dead person. Hence the Septuagint renders the Hebrew for "necromancers" here "ventriloquists" (compare Isa 29:4).
      mutter--moan.
      should not, &c.--The answer which Isaiah recommends to be given to those advising to have recourse to necromancers.
      for the living, &c.--"should one, for the safety of the living, seek unto (consult) the dead?" [GESENIUS]. LOWTH renders it, "In place of (consulting) the living, should one consult the dead?"

JFB.