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

The Prophet (ﷺ) 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.”
Reference : Sahih al-Bukhari 5641, 5642
In-book reference : Book 75, Hadith 2