حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، أَنَّهُ سَمِعَ عُرْوَةَ، يَقُولُ دَخَلْتُ عَلَى مَرْوَانَ بْنِ الْحَكَمِ فَذَكَرْنَا مَا يَكُونُ مِنْهُ الْوُضُوءُ ‏.‏ فَقَالَ مَرْوَانُ وَمِنْ مَسِّ الذَّكَرِ ‏.‏ فَقَالَ عُرْوَةُ مَا عَلِمْتُ ذَلِكَ ‏.‏ فَقَالَ مَرْوَانُ أَخْبَرَتْنِي بُسْرَةُ بِنْتُ صَفْوَانَ أَنَّهَا سَمِعَتْ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏"‏مَنْ مَسَّ ذَكَرَهُ فَلْيَتَوَضَّأْ ‏"
Translation
Narrated Busrah daughter of Safwan

Abdullah ibn Maslamah narrated to us, from Malik, from Abdullah ibn Abu Bakr, that he heard Urwah say: I entered upon Marwan ibn al-Hakam and we mentioned what requires ablution. Marwan said: "And from touching the penis." Urwah said: "I do not know that." Marwan said: "Busrah bint Safwan informed me that she heard the Messenger of Allah, peace and blessings be upon him, saying: 'Whoever touches his penis, let him perform ablution.'"