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. Who is among you that feareth the Lord ... that walketh in darkness, and hath no light? let him trust in the name of the Lord. Messiah exhorts the godly after His example (Isaiah 49:4-5; Isaiah 42:4), when in circumstances of trial ("darkness, Isaiah 47:5), to trust in the arm of Yahweh alone. "Who is among" - i:e., Whosoever (Judges 7:3).
That obeyeth the voice of his servant - namely, Messiah. The godly, 'honour the Son, even as they honour the Father' (John 5:23).
Darkness - (Micah 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?"
No light - rather, no splendour: 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 (Psalms 112:4; Psalms 97:11; Psalms 37:24).
Let him trust in the name of the Lord - as Messiah did (Isaiah 50:8-9).