Yahya related to me from Malik that Muhammad ibn Abdullah ibn AbiSasaca said that he heard Abu'l-Hubab Said ibn Yasar say that he hadheard Abu Hurayra say, "The Messenger of Allah, may Allah bless himand grant him peace, said, 'Allah afflicts the one for whom He desiresgood.'"
USC-MSA web (English) reference: Book 50, Hadith 7
Arabic reference: Book 50, Hadith 1720