The Messenger of Allah said: "The believer is not afflicted by the prick of a thorn or what is worse (or greater) than that, except that by it Allah raises him in rank and removes sin from him."
Jami` at-Tirmidhi Book 10, Hadith 1
← Previous Hadith "I said to Anas bin Malik: 'Narrated something to me that you understand about where the Messenger of Allah performed Zuhr on the Day of Tarwiyah.' He said: 'In Mina.'" "I said: 'So where did he pray Asr on the day of departure?' He said: 'In Al-Abtab.' Then he said: 'Do what your leaders do.'"

Jami` at-Tirmidhi Book 9, Hadith 158 Next Hadith → The Messenger of Allah said: "Nothing afflicts the believer, whether fatigue, grief, disease - even a worry that concerns him - except that by it, Allah removes something from his bad deeds."

Jami` at-Tirmidhi Book 10, Hadith 2