Sahih Bukhari
Patients
Volume: 007 / Book Number: 070 / Hadith Number: 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."