Musnad Ahmad
It was narrated that Humran said: Uthman was sitting in alMaqa`id. He called for water and did wudoo’, then he said: I saw the Messenger of Allah (ﷺ) doing wudoo` in this place where I am sitting then he said: “whoever does wudoo’ as I have done, then gets up and prays two rak`ahs, his previous sins will be forgiven.” And the Messenger of Allah (ﷺ) said: `Do not become complacent.`
حَدَّثَنَا أَبُو الْمُغِيرَةِ، حَدَّثَنَا الْأَوْزَاعِيُّ، حَدَّثَنَا يَحْيَى بْنُ أَبِي كَثِيرٍ، عَنْ مُحَمَّدِ بْنِ إِبْرَاهِيمَ التَّيْمِيِّ، حَدَّثَنِي شَقِيقُ بْنُ سَلَمَةَ، عَنْ حُمْرَانَ، قَالَ كَانَ عُثْمَانُ رَضِيَ اللَّهُ عَنْهُ قَاعِدًا فِي الْمَقَاعِدِ فَدَعَا بِوَضُوءٍ فَتَوَضَّأَ ثُمَّ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَوَضَّأَ فِي مَقْعَدِي هَذَا ثُمَّ قَالَ مَنْ تَوَضَّأَ مِثْلَ وُضُوئِي هَذَا ثُمَّ قَامَ فَرَكَعَ رَكْعَتَيْنِ غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنْبِهِ وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا تَغْتَرُّوا.
Grade: Sahih (Darussalam) [ al bukhari (160) and Muslim (227)] (Darussalam)
Reference