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Narrated Abu Sa'id Al-Khudri (RA) and Abu Huraira (RA): The Prophet (peace be upon him) said, "No fatigue, nor disease, nor sorrow, nor sadness, nor hurt, nor distress befalls a Muslim, even if it were the prick he receives from a thorn, but that Allah expiates some of his sins for that." [Sahih Bukhari]