The Book of Ghusl and Tayammum
4/30. Chapter:
Wudu' After Touching One's Penis
Sunan an-Nasai
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.'"
Reference : Sunan an-Nasa'i 446In-book reference : Book 4, Hadith 52English translation : Vol. 1, Book 4, Hadith 447