"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.'"  

نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَبُولَ قَائِمًا سَمِعْتُ مُحَمَّدَ بْنَ يَزِيدَ أَبَا عَبْدِ اللَّهِ يَقُولُ سَمِعْتُ أَحْمَدَ بْنَ عَبْدِ الرَّحْمَنِ الْمَخْزُومِيَّ يَقُولُ قَالَ سُفْيَانُ الثَّوْرِيُّ فِي حَدِيثِ عَائِشَةَ أَنَا رَأَيْتُهُ يَبُولُ قَاعِدًا قَالَ الرَّجُلُ أَعْلَمُ بِهَذَا مِنْهَا قَالَ أَحْمَدُ بْنُ عَبْدِ الرَّحْمَنِ كَانَ مِنْ شَأْنِ الْعَرَبِ الْبَوْلُ قَائِمًا أَلاَ تَرَاهُ فِي حَدِيثِ عَبْدِ الرَّحْمَنِ ابْنِ حَسَنَةَ يَقُولُ قَعَدَ يَبُولُ كَمَا تَبُولُ الْمَرْأَةُ