Who is he... ? Supply the obvious Ellipsis (App-6) thus: "[Thou askedst] 'Who is this?. "&c.; which Jehovah did ask in Job 38:1-3.
Related Commentaries of Job 42:3
Job 42:3
3 Who is he that hideth counsel without knowledge? therefore have I uttered that I understood not; things too wonderful for me, which I knew not.