Sahih al-Bukhari 223
صحيح البخاري#223SahihNarrated Um Qais bint Mihsin:I brought my young son, who had not started eating (ordinary food) to Allah's Messenger (ﷺ) who took him and made him sit in his lap. The child urinated on the garment of the Prophet, so he asked for water and poured it over the soiled (area) and did not wash it
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 4:89