Sahih Muslim 2573
Sahih Muslim · Book 45: The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship · The Reward Of The Believer For Whatever Befalls Him Of Sickness, Grief And The Like, Even A Thorn That Pricks Him
Abu Sa'id and abu Huraira reported that they heard Allah's Messenger (ﷺ) as saying:
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، وَأَبُو كُرَيْبٍ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ ، عَنِ الْوَلِيدِ بْنِ، كَثِيرٍ عَنْ مُحَمَّدِ بْنِ عَمْرِو بْنِ عَطَاءٍ ، عَنْ عَطَاءِ بْنِ يَسَارٍ ، عَنْ أَبِي سَعِيدٍ ، وَأَبِي، هُرَيْرَةَ أَنَّهُمَا سَمِعَا رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَا يُصِيبُ الْمُؤْمِنَ مِنْ وَصَبٍ وَلاَ نَصَبٍ وَلاَ سَقَمٍ وَلاَ حَزَنٍ حَتَّى الْهَمِّ يُهَمُّهُ إِلاَّ كُفِّرَ بِهِ مِنْ سَيِّئَاتِهِ " .
Never a believer is stricken with discomfort, hardship or illness, grief or even with mental worry that his sins are not expiated for him.