Sahih al-Bukhari, Book 4, Hadith 89 (In-Book) ⓘ
Narrated `Aisha: (the mother of faithful believers) A child was brought to Allah's Messenger and it urinated on the garment of the Prophet. The Prophet asked for water and poured it over the soiled place.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ، أَنَّهَا قَالَتْ أُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِصَبِيٍّ، فَبَالَ عَلَى ثَوْبِهِ، فَدَعَا بِمَاءٍ فَأَتْبَعَهُ إِيَّاهُ.
also referenced under: Hadith 222 (DarusSalam) & Volume 1, Book 4, Hadith 222 (USC-MSA)