Mu`adh bin ‘Abdur-Rahman narrated that Humran bin Aban told him:

I came to ‘Uthman bin `Affan (رضي الله عنه) when he was sitting in al-Maqa`id. He did wudoo and did it well, then he said: I saw the Messenger of Allah (ﷺ) when he was in this place; he did wudoo’ and did it well, then he said: “Whoever does wudoo’ as I have done, then goes to the mosque and prays two rakats, his previous sins will be forgiven.” And he said: The Messenger of Allah (ﷺ) said: `Do not become complacent.”

حَدَّثَنَا حَسَنُ بْنُ مُوسَى، حَدَّثَنَا شَيْبَانُ، عَنْ يَحْيَى، عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ بْنِ الْحَارِثِ التَّيْمِيِّ، قَالَ أَخْبَرَنِي مُعَاذُ بْنُ عَبْدِ الرَّحْمَنِ، أَنَّ حُمْرَانَ بْنَ أَبَانَ، أَخْبَرَهُ قَالَ أَتَيْتُ عُثْمَانَ بْنَ عَفَّانَ رَضِيَ اللَّهُ عَنْهُ وَهُوَ جَالِسٌ فِي الْمَقَاعِدِ فَتَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُوَ فِي هَذَا الْمَجْلِسِ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ ثُمَّ قَالَ مَنْ تَوَضَّأَ مِثْلَ وُضُوئِي هَذَا ثُمَّ أَتَى الْمَسْجِدَ فَرَكَعَ فِيهِ رَكْعَتَيْنِ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ وَقَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَلَا تَغْتَرُّوا‏.‏