Abu Saeed reported that the Prophet ﷺ said, "No fatigue, illness, anxiety, sorrow, harm, or distress befalls a Muslim, not even a thorn that pricks him, without Allah expiating some of his sins thereby."
وأبي سعيد، عن النبي ﷺ قال: ما يصيب المسلم من نصب، ولا وصب، ولا هم، ولا حزن، ولا أذى، ولا غم، حتى الشوكة يشاكها إلا كفر الله بها من خطاياه.
Bukhari narrated it in the Book of Illness (5641, 5642) and Muslim in the Book of Righteousness and Maintaining Ties of Kinship (2573), both from the hadith of Muhammad bin Amr bin Ata, from Ata bin Yasar, from Abu Saeed and Abu Hurairah, and he mentioned the hadith, with the wording given here being Bukhari's.In Muslim's version it reads, "even the worry that troubles him, Allah expiates through it some of his sins."Tirmidhi said (966), I heard Jarud say, I heard Wakee say, "It has not been heard that worry can be an expiation except in this hadith."As for his saying "nasab and wasab," both are pronounced with two fathas. Nasab means fatigue, while wasab means persistent, lingering pain.