Yeshayah 35:8

And a maslul (highway) shall be there, and a derech (road), and it shall be called The Derech HaKodesh (The Holy Road); the tameh (unclean, impure person [see Isa 26:7]) shall not pass along it, inasmuch as it shall be for them; that is, the Holech Derech (Walker of the Road, i.e., whoever is the [Redeemed] Wayfarer on the Derech HaKodesh), even evilim (morally bad foolish people) shall not go astray thereon.