I heard Messenger of Allah ﷺ as saying: There is nothing (in the form of trouble) that comes to a believer even if it is the pricking of a thorn that there is decreed for him by Allah good or his sins are obliterated.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَا مِنْ شَىْءٍ يُصِيبُ الْمُؤْمِنَ حَتَّى الشَّوْكَةِ تُصِيبُهُ إِلاَّ كَتَبَ اللَّهُ لَهُ بِهَا حَسَنَةً أَوْ حُطَّتْ عَنْهُ بِهَا خَطِيئَةٌ  

I heard Messenger of Allah ﷺ as saying: There is nothing (in the form of trouble) that comes to a believer even if it is the pricking of a thorn that there is decreed for him by Allah good or his sins are obliterated. (Using translation from Muslim 2572g)   

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ قَالَ مَا مِنْ شَيْءٍ يُصِيبُ الْمُؤْمِنَ حَتَّى الشَّوْكَةِ تُصِيبُهُ إِلَّا كَتَبَ لَهُ بِهَا حَسَنَةً أَوَ حَطَّ عَنْهُ بِهَا خَطِيئَةً  

"مَا مِنْ عَبْدٍ يسْجُدُ لله سَجْدةً إِلا كَتَبَ اللهُ لهُ بها حسَنَةً وَحطَّ عنْهُ بها خَطِيئةً".  

"مَا مِنْ مُسْلِم يَشِيبُ شَيبَةً في الإِسْلامِ إِلَّا كتَب الله لَه بهَا حَسَنَةً، وَحَطَّ عَنْه بها خَطيئَةً".