Sahih Muslim Book - 2, Hadith - 540

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ وَعُثْمَانُ بْنُ مُحَمَّدِ بْنِ أَبِي شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ الْحَنْظَلِيُّ وَاللَّفْظُ لِقُتَيْبَةَ قَالَ إِسْحَاقُ أَخْبَرَنَا وَقَالَ الْآخَرَانِ حَدَّثَنَا جَرِيرٌ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنْ أَبِيهِ عَنْ حُمْرَانَ مَوْلَى عُثْمَانَ قَالَ سَمِعْتُ عُثْمَانَ بْنَ عَفَّانَ وَهُوَ بِفِنَاءِ الْمَسْجِدِ فَجَاءَهُ الْمُؤَذِّنُ عِنْدَ الْعَصْرِ فَدَعَا بِوَضُوءٍ فَتَوَضَّأَ ثُمَّ قَالَ وَاللَّهِ لَأُحَدِّثَنَّكُمْ حَدِيثًا لَوْلَا آيَةٌ فِي كِتَابِ اللَّهِ مَا حَدَّثْتُكُمْ إِنِّي سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ لَا يَتَوَضَّأُ رَجُلٌ مُسْلِمٌ فَيُحْسِنُ الْوُضُوءَ فَيُصَلِّي صَلَاةً إِلَّا غَفَرَ اللَّهُ لَهُ مَا بَيْنَهُ وَبَيْنَ الصَّلَاةِ الَّتِي تَلِيْهَا.

It was narrated that Humran, the freed slave of 'Uthman, said: "I heard 'Uthman bin 'Affan, while he was in the courtyard of the Masjid, and the Mu'adhdhin came to him at the time of 'Asr. He called for water for Wudu' and performed Wudu', then he said: 'By Allah, I am going to tell you a Hadith which, were it not for a Verse in the Book of Allah, I would not have told you. I heard the Messenger of Allah (s.a.w) say: "No Muslim man performs Wudu' and performs Wudu' well, then performs Salat, but he will be forgiven for whatever (sins) come between that and the Salat which follows it."