Job 32:2-3, 5

Then was kindled the wrath of Elihu the son of Barachel the Buzite, of the kindred of Ram: against Job was his wrath kindled, because he justified himself rather than God. Also against his three friends was his wrath kindled, because they had found no answer, and yet had condemned Job.

When Elihu saw that there was no answer in the mouth of these three men, then his wrath was kindled.