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
suyuti:20329a –
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السيوطي:٢٠٣٢٩a –

"مَنْ أَخْطَأَ خَطِيئَةً، أَوْ أَذْنَبَ ذَنْبًا ثُمَّ نَدِمَ فهُوَ كَفَّارَتُهُ".  

[طب] الطبرانى في الكبير [هب] البيهقى في شعب الإيمان عن ابن مسعود

See similar narrations below:

Collected by Ṭabarānī
tabarani:10537 – ʿAlī b. Ibrāhīm al-ʿĀmirī al-Kūfī > Aḥmad b. Yūnus > al-Ḥasan b. Ṣāliḥ > Abū Saʿd al-Baqqāl > ʿAbdullāh b. Maʿqil > ʿAbdullāh b. Masʿūd

that the Prophet ﷺ said: “Anyone who did a wrong or committed a sin and is ashamed of it, then this will be his atonement.”  

الطبراني:١٠٥٣٧ – حَدَّثَنَا عَلِيُّ بْنُ إِبْرَاهِيمَ الْعَامِرِيُّ الْكُوفِيُّ ثنا أَحْمَدُ بْنُ يُونُسَ ثنا الْحَسَنُ بْنُ صَالِحٍ عَنْ أَبِي سَعْدٍ الْبَقَّالِ عَنْ عَبْدِ اللهِ بْنِ مَعْقِلٍ عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ أَخْطَأَ بِخَطِيئَةٍ وَأَذْنَبَ ذَنْبًا ثُمَّ نَدِمَ فَهُوَ كَفَّارَتُهُ»