Midrash sur Les Proverbes 25:4

After the calf and its worshippers were destroyed, he came before the Holy One, blessed be He, pleading and beseeching, as it is said: And Moses returned unto the Lord and said: “Oh, this people have sinned … yet now, if Thou wilt forgive their sin (ibid., vv. 31–32). And the Holy One, said unto Moses: Whosoever hath sinned against Me … and now, go and lead the people unto the place (ibid., v. 33). In the day when I visit, I will visit their sins upon them (ibid., v. 34); that is, I shall sit in judgment against them on the Day of Atonement. Then the guiltless will be exonerated and the guilty will be condemned, as is said: In the day when I visit, etc. R. Hanina said: Whoever says the Lord is lax (in dispensing) justice, may his bowels become loose. He is simply long-suffering. Hence, In the day when I visit, I will visit their sin upon them. After he judged them and carried out the verdict, he called out: Master of the Universe, the calf and those who worshipped it have already been consumed. Perhaps you have something else against Your people? He replied: Depart, go up hence. Therefore Solomon said: Take away the dross from the silver (Prov. 25:4).