Albert Barnes Commentary Job 40:6

"Then Jehovah answered Job out of the whirlwind, and said," — Job 40:6 (ASV)

Then answered the Lord unto Job out of the whirlwind - See the notes at (Job 38:1). God here resumes the argument which had been interrupted in order to give Job an opportunity to speak and to carry his cause before the Almighty, as he had desired, see (Job 40:2). Since Job had nothing to say, the argument, which had been suspended, is resumed and completed.