Sahih al-Bukhari 222

Arabic

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.‏

English translation

Narrated `Aisha:(the mother of faithful believers) A child was brought to Allah's Messenger (ﷺ) and it urinated on the garment of the Prophet. The Prophet (ﷺ) asked for water and poured it over the soiled place

Reference: Sahih al-Bukhari 222, Book of Ablutions (Wudu'). English translation by Dr. Muhammad Muhsin Khan.