"The Messenger of Allah saw me urinating while standing, and he said: 'O 'Umar, do not urinate standing up.' So I never urinated whilst standing after that."
Sunan Ibn Majah Book 1, Hadith 42
← Previous Hadith "If anyone tells you that the Messenger of Allah urinated while standing, do not believe him, for I (always) saw him urinating while sitting down."

Sunan Ibn Majah Book 1, Hadith 41 Next Hadith → "The Messenger of Allah forbade us to urinate while standing." (Da'if)

I heard Muhammed bin Yazid, Abu 'Abdullah, say: "I heard Ahmad bin 'Abdur-Rahman Al-Makhzumi say: 'Sufyan Ath-Thawri said concerning the Hadith of 'Aisha- 'I (always) saw him urinating whilst sitting down' - a man knows more about that (about such matters) than she.' Ahmad bin 'Abdur-Rahman said: 'It was the custom of the Arabs to urinate standing up. Do you not see that in the Hadith of 'Abdur-Rahman bin Hasanah it was said: 'He sits down to urinate as a woman does.'"

Sunan Ibn Majah Book 1, Hadith 43