isaiah 50:10 Who is among you that feareth the LORD, that obeyeth the voice of his servant, that walketh in darkness, and hath no light? let him trust in the name of the LORD, and stay upon his God. - Free Bible Online

      10. Messiah exhorts the godly after His example (Isa 49:4, 5; 42:4) when in circumstances of trial ("darkness," Isa 47:5), to trust in the arm of Jehovah alone.
      Who is, &c.--that is, Whosoever (Jud 7:3).
      obeyeth . . . servant--namely, Messiah. The godly "honor the Son, even as they honor the Father" (Joh 5:23).
      darkness-- (Mic 7:8, 9). God never had a son who was not sometimes in the dark. For even Christ, His only Son, cried out, "My God, My God, why hast Thou forsaken Me?"
      light--rather, "splendor"; bright sunshine; for the servant of God is never wholly without "light" [VITRINGA]. A godly man's way may be dark, but his end shall be peace and light. A wicked man's way may be bright, but his end shall be utter darkness (Ps 112:4; 97:11; 37:24).
      let him trust in the name of the Lord--as Messiah did (Isa 50:8, 9).

JFB.