Sunan an-Nasa'i 856
سنن النسائي#856Sahihأَخْبَرَنَا سُلَيْمَانُ بْنُ دَاوُدَ، عَنِ ابْنِ وَهْبٍ، قَالَ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، أَنَّ الْحُكَيْمَ بْنَ عَبْدِ اللَّهِ الْقُرَشِيَّ، حَدَّثَهُ أَنَّ نَافِعَ بْنَ جُبَيْرٍ وَعَبْدَ اللَّهِ بْنَ أَبِي سَلَمَةَ حَدَّثَاهُ أَنَّ مُعَاذَ بْنَ عَبْدِ الرَّحْمَنِ حَدَّثَهُمَا عَنْ حُمْرَانَ، مَوْلَى عُثْمَانَ بْنِ عَفَّانَ عَنْ عُثْمَانَ بْنِ عَفَّانَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَنْ تَوَضَّأَ لِلصَّلاَةِ فَأَسْبَغَ الْوُضُوءَ ثُمَّ مَشَى إِلَى الصَّلاَةِ الْمَكْتُوبَةِ فَصَلاَّهَا مَعَ النَّاسِ أَوْ مَعَ الْجَمَاعَةِ أَوْ فِي الْمَسْجِدِ غَفَرَ اللَّهُ لَهُ ذُنُوبَهُ " .
It was narrated that 'Uthman bin 'Affan said:"I heard the Messenger of Allah (ﷺ) say: 'Whoever does wudu' properly, then walks to (attend) the prescribed prayer, and prays with the people or with the congregation or in the Masjid, Allah will forgive him his sins
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 10:80