حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَنَّهَا قَالَتْ أُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِصَبِيٍّ فَبَالَ عَلَى ثَوْبِهِ فَدَعَا رَسُولُ اللَّهِ صلى الله عليه وسلم بِمَاءٍ فَأَتْبَعَهُ إِيَّاهُ ‏.‏

Yahya related to me from Malik from Hisham ibn Urwa from hisfather that A'isha, the wife of the Prophet, may Allah bless him andgrant him peace, said, "An infant boy was brought to the Messenger ofAllah, may Allah bless him and grant him peace, and it urinated onhim. The Messenger of Allah, may Allah bless him and grant him peace,called for some water and rubbed over the urine with it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 2 Hadith 140
Web Ref:  Muwatta Imam Malik Book 2 Hadith 111