Yeshayah 8:18-20 Orthodox Jewish Bible (OJB)
18 Hinei, I and the yeladim whom Hashem hath given me are for otot and for mofetim [see Zecharyah 3:8] in Yisroel from Hashem Tzva’os, which dwelleth in Mt Tziyon.
19 And when they shall say unto you, Seek unto mediums that have familiar spirits, and unto spiritists that whisper, and that mutter: should not Am seek unto Elohav? Should they consult the mesim (dead ones) for the benefit of the chayyim (living)?
20 To the torah (teaching of G-d) and to the te’udah (recorded testimony, see verse 16); if they speak not according to Davar HaZeh, it is because there is no shachar (dawn, light) in them.