Charles Ellicott Commentary Isaiah 50:10

"Who is among you that feareth Jehovah, that obeyeth the voice of his servant? he that walketh in darkness, and hath no light, let him trust in the name of Jehovah, and rely upon his God." — Isaiah 50:10 (ASV)

That obeys the voice of his servant. —The question may be asked of any servant of Jehovah, such as Isaiah himself, but it receives its highest application in the Servant who has appeared as speaking in the preceding verses.

That walks in darkness. —These words arise at once from the prophet’s own experience and that of the ideal Servant. All true servants know what it is to feel as if the light they looked for had failed them for a time, to utter a prayer like that of Ajax, “Give light, and let us die” (Hom. Il. xvii. 647). The Servant felt it when he uttered the cry, My God, my God, why have you forsaken me? (Matthew 27:46).

For such a one, the words of counsel were, “Trust, in spite of the darkness.” So the cry of the forsaken Servant was followed by the words, Father, into your hands I commend my spirit (Luke 23:46).