Once the Prophet (ﷺ) went to the dumps of some people and passed urine while standing. He then asked for water and so I brought it to him and he performed ablution.
Sahih al-Bukhari Book 4, Hadith 90
← Previous Hadith 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.

Sahih al-Bukhari Book 4, Hadith 89 Next Hadith → The Prophet (ﷺ) and I walked till we reached the dumps of some people. He stood, as any one of you stands, behind a wall and urinated. I went away, but he beckoned me to come. So I approached him and stood near his back till he finished.

Sahih al-Bukhari Book 4, Hadith 91