Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
tabarani:16953 – Abū Ḥuṣayn b. Muḥammad b. al-Ḥasan al-Wādiʿī al-Qāḍī > ʿUbayd b. Yaʿīsh > Yūnus b. Bukayr > Ṭalḥah b. Yaḥyá > Abū Burdah b. Abū Mūsá

[Machine] I heard the Messenger of Allah ﷺ saying, "No Muslim is afflicted with harm to his body except that it serves as an expiation for his sins." And this is the severest form of harm.  

الطبراني:١٦٩٥٣ – حَدَّثَنَا أَبُو حُصَيْنِ بْنُ مُحَمَّدِ بْنِ الْحَسَنِ الْواَدِعِيُّ الْقَاضِي ثنا عُبَيْدُ بْنُ يَعِيشَ ثنا يُونُسُ بْنُ بُكَيْرٍ ثنا طَلْحَةُ بْنُ يَحْيَى عَنْ أَبِي بُرْدَةَ بْنِ أَبِي مُوسَى قَالَ دَخَلْتُ عَلَى مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ وَبِظَهْرِهِ قَرْحَةٌ وَهُوَ يَتَأَوَّهُ مِنْهَا تَأَوُّهًا شَدِيدًا فَقُلْتُ أَكُلُّ هَذَا مِنْ هَذِهِ؟ فَقَالَ مَا يَسُرُّنِي أَنَّ هَذَا التَّأَوُّهَ لَمْ يَكُنْ ثُمَّ قَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «مَا مِنْ مُسْلِمٍ يُصِيبُهُ أَذًى فِي جَسَدِهِ إِلَّا كَانَ كَفَّارَةً لِخَطَايَاهُ» وَهَذَا أَشَدُّ الْأَذَى  

See similar narrations below:

Collected by Ḥākim, Suyūṭī
hakim:1282 – Abū ʿAbdullāh Muḥammad b. ʿAbdullāh al-Zāhid al-Aṣbahānī > Aḥmad b. Mihrān > ʿUbaydullāh b. Mūsá > Isrāʾīl > ʿAbdullāh b. al-Mukhtār > Ibn Sīrīn > Abū Hurayrah

[Machine] I heard the Messenger of Allah ﷺ saying, "The morning prayer at its prescribed time expiates for sins committed between it and the previous evening prayer."  

الحاكم:١٢٨٢ – أَخْبَرَنَا أَبُو عَبْدِ اللَّهِ مُحَمَّدُ بْنُ عَبْدِ اللَّهِ الزَّاهِدُ الْأَصْبَهَانِيُّ ثنا أَحْمَدُ بْنُ مِهْرَانَ ثنا عُبَيْدُ اللَّهِ بْنُ مُوسَى أَنْبَأَ إِسْرَائِيلُ عَنْ عَبْدِ اللَّهِ بْنِ الْمُخْتَارِ عَنِ ابْنِ سِيرِينَ عَنْ أَبِي هُرَيْرَةَ قَالَ

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «وَصَبُ الْمُؤْمِنِ كَفَّارَةٌ لِخَطَايَاهُ»