isaiah 35:8 And an highway shall be there, and a way, and it shall be called The way of holiness; the unclean shall not pass over it; but it shall be for those: the wayfaring men, though fools, shall not err therein. - Free Bible Online

      8. highway--such a causeway (raised way, from a Hebrew root, "to cast up") as was used for the march of armies; valleys being filled up, hills and other obstructions removed (Isa 62:10; compare Isa 40:3, 4).
      way of holiness--Hebraism for "the holy way." HORSLEY translates, "the way of the Holy One;" but the words that follow, and Isa 35:10, show it is the way leading the redeemed back to Jerusalem, both the literal and the heavenly (Isa 52:1; Joe 3:17; Re 21:27); still Christ at His coming again shall be the Leader on the way, for which reason it is called, "The way of the Lord" (Isa 40:3; Mal 3:1).
      it shall be for those: the wayfaring men--rather, "He (the Holy One) shall be with them, walking in the way" [HORSLEY].
      though fools--rather, "And (even) fools," that is, the simple shall not go astray, namely, because "He shall be with them" (Mt 11:25; 1Co 1:26-28).

JFB.