Midrash sur Job 10:2

(Bamidbar 12:9) "And the wrath of the L-rd burned in them, and He departed": After He apprised them of their offense, He decreed ostracism upon them. Now does this not follow a fortiori, viz.: If He who spoke and brought the world into being did not vent His wrath upon flesh and blood until He apprised them of their offense, how much more so should flesh and blood not vent his anger upon his neighbor until he apprises him of his offense! R. Nathan says: He apprised them of their offense and then decreed ostracism upon them so that they not say as Iyyov did (Iyyov 10:2) "Apprise me of what You accuse me!"