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Bukhari :: Book 7 :: Volume 70 :: Hadith 545

Narrated Abu Sa'id Al-Khudri and Abu Huraira:

The Prophet 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."