مُوَطَّأُ مَالِكٍ
Muwatta Malik 140
Purity
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 his father that A'isha, the wife of the Prophet, (ﷺ), said, "An infant boy was brought to the Messenger of Allah, (ﷺ), and it urinated on him. The Messenger of Allah, (ﷺ), called for some water and rubbed over the urine with it."
Arabic/English book reference: Book 2, Hadith 111