Sunan an-Nasa'i, hadith 446

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ، عَنْ مَرْوَانَ بْنِ الْحَكَمِ، أَنَّهُ قَالَ الْوُضُوءُ مِنْ مَسِّ الذَّكَرِ فَقَالَ مَرْوَانُ أَخْبَرَتْنِيهِ بُسْرَةُ بِنْتُ صَفْوَانَ ‏.‏ فَأَرْسَلَ عُرْوَةُ قَالَتْ ذَكَرَ رَسُولُ اللَّهِ صلى الله عليه وسلم مَا يُتَوَضَّأُ مِنْهُ فَقَالَ ‏ "‏ مِنْ مَسِّ الذَّكَرِ ‏"‏ ‏.‏

It was narrated that Marwan bin Al-Hakam said that one should perform Wudu' after touching one's penis. Marwan said:"Busrah bint Safwan told me that." 'Urwah sent someone to check that, and she said: "The Messenger of Allah (ﷺ) mentioned what Wudu' is done for, and said: 'Touching the penis