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
quran:3:135 –

And those who, when they commit an immorality or wrong themselves ˹by transgression˺, remember Allah and seek forgiveness for their sins - and who can forgive sins except Allah? - and ˹who˺ do not persist in what they have done while they know.  

And who when they commit an indecency, a despicable sin such as adultery, or wrong themselves, with less than that, such as a kiss, remember God, that is to say, His threat of punishment, and pray forgiveness for their sins — and who, that is, none, shall forgive sins but God? — and who do not persist, persevere, in what they did, but have desisted from it, knowing, that what they did was sinful.
القرآن:٣:١٣٥ –

وَالَّذِينَ إِذَا فَعَلُوا فَاحِشَةً أَوْ ظَلَمُوا أَنْفُسَهُمْ ذَكَرُوا اللَّهَ فَاسْتَغْفَرُوا لِذُنُوبِهِمْ وَمَنْ يَغْفِرُ الذُّنُوبَ إِلَّا اللَّهُ وَلَمْ يُصِرُّوا عَلَىٰ مَا فَعَلُوا وَهُمْ يَعْلَمُونَ  

{والذين إذا فعلوا فاحشة} ذنبا قبيحا كالزنا {أو ظلموا أنفسهم} بدونه كالقُبلة {ذكروا الله} أي وعيده {فاستغفروا لذنوبهم ومن} أي لا {يغفر الذنوب إلا الله ولم يصروا} يداوموا {على ما فعلوا} بل أقلعوا عنه {وهم يعلمون} أن الذي أتوه معصية.