Yahya related to me from Malik that he had heard from Abu'l-HubabSaid ibn Yasar from Abu Hurayra that the Messenger of Allah, may Allahbless him and grant him peace, said, "The mumin continues to be struckby misfortune in his children and close friends until he meets Allahwith no wrong actions."
USC-MSA web (English) reference: Book 16, Hadith 40
Arabic reference: Book 16, Hadith 562