Isaiah 8:18-20 Young's Literal Translation (YLT)
18 Lo, I, and the children whom Jehovah hath given to me, [Are] for signs and for wonders in Israel, From Jehovah of Hosts, who is dwelling in Mount Zion.
19 And when they say unto you, `Seek unto those having familiar spirits, And unto wizards, who chatter and mutter, Doth not a people seek unto its God? -- For the living unto the dead!
20 To the law and to the testimony! If not, let them say after this manner, `That there is no dawn to it.'