Midrash sur Job 38:23

Behold, tomorrow about this time I will cause it to rain a very grievous hail, such as hath not been seen (Exod. 9:18). Zabdi the son of Levi said: He made a mark upon the wall and told him that when the sun reached that mark tomorrow, the hail would fall. Such as hath not been seen implies that it would be a hail like none that had occurred previously, and would occur again only in the days to come, that is, in the time of Gog and Magog, as it is said: Which I have reserved against the time of trouble, against the day of battle and war (Job 38:23). It also says: And I will plead against him with pestilence and with blood; an overflowing shower and great hailstones (Exod. 38:22). And now therefore send, hasten in thy cattle (ibid. 9:19), on account of the plague of hail. He said to him: Wicked one, the Lord is righteous indeed.