"I entered upon Mawan bin Al-Hakam and we mentioned the things for which Wudu' is done. Marwan said: 'Wudu' should be done after touching the penis.' 'Urwah said: 'I did not know that.' Marwan said: 'Busrah bint Safwan told me that she heard the Messenger of Allah ﷺ say: "And if any one of you touches his penis, let him do Wudu'."
مَرْوَانُ مِنْ مَسِّ الذَّكَرِ الْوُضُوءُ فَقَالَ عُرْوَةُ مَا عَلِمْتُ ذَلِكَ فَقَالَ مَرْوَانُ أَخْبَرَتْنِي بُسْرَةُ بِنْتُ صَفْوَانَ أَنَّهَا سَمِعَتْ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا مَسَّ أَحَدُكُمْ ذَكَرَهُ فَلْيَتَوَضَّأْ