ذِكْرُ الْبَيَانِ بِأَنَّ اللَّهَ جَلَّ وَعَلَا إِنَّمَا يَغْفِرُ ذُنُوبَ الْمُتَوَضِّئِ الَّتِي ذَكَرْنَاهَا إِذَا كَانَ مُجْتَنِبًا لِلْكَبَائِرِ دُونَ مَنْ لَمْ يَجْتَنِبْهَا
I was with Uthman, and he called for ablution water and said: I heard Messenger of Allah ﷺ say: When the time for a prescribed prayer comes, if any Muslim performs ablution well and offers his prayer with humility and bowing, it will be an expiation for his past sins, so long as he has not committed a major sin; and this applies for all times. (Using translation from Muslim 228)
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «مَا مِنِ امْرِئٍ مُسْلِمٍ تَحْضُرُهُ الصَّلَاةُ الْمَكْتُوبَةُ فَيُحْسِنُ وُضُوءَهَا وَرُكُوعَهَا وَخُشُوعَهَا إِلَّا كَانَتْ كَفَّارَةً لِمَا قَبْلَهَا مِنَ الذُّنُوبِ مَا لَمْ يَأْتِ كَبِيرَةً وَذَلِكَ الدَّهْرَ كُلَّهُ»