Deut. 18:10-12; Isa. 8:19
“To ‘peep’ is to chirp as a bird. According to J.R. Dummelow, chirping refers ‘to the thin and feeble voice of ghosts from Sheol’ [hell] (The One Volume Bible Commentary, p. 420).” (Hoyt W. Brewster, Jr., Isaiah Plain and Simple, p. 82)