Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:29 – ʿAlī b. Ḥujr > Sharīk > al-Miqdām b. Shurayḥ from his father > ʿĀʾishah > Man Ḥaddathakum

"Whoever tells you that the Messenger of Allah ﷺ urinated standing up, do not believe him, for he would not urinate except while squatting."  

النسائي:٢٩ – أَخْبَرَنَا عَلِيُّ بْنُ حُجْرٍ قَالَ أَنْبَأَنَا شَرِيكٌ عَنِ الْمِقْدَامِ بْنِ شُرَيْحٍ عَنْ أَبِيهِ عَنْ عَائِشَةَ قَالَتْ مَنْ حَدَّثَكُمْ

أَنَّ رَسُولَ اللَّهِ ﷺ بَالَ قَائِمًا فَلاَ تُصَدِّقُوهُ مَا كَانَ يَبُولُ إِلاَّ جَالِسًا  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:25 – ʿAlī b. Ḥajar b. Iyās > Sharīk > al-Miqdām b. Shurayḥ from his father > ʿĀʾishah > Man Ḥaddathakum

"Whoever tells you that the Messenger of Allah ﷺ urinated standing up, do not believe him, for he would not urinate except while squatting." (Using translation from Nasāʾī 29)  

الكبرى للنسائي:٢٥ – أَخْبَرَنَا عَلِيُّ بْنُ حَجَرِ بْنِ إِيَاسٍ قَالَ حَدَّثَنَا شَرِيكٌ عَنِ الْمِقْدَامِ بْنِ شُرَيْحٍ عَنْ أَبِيهِ عَنْ عَائِشَةَ قَالَتْ «§مَنْ حَدَّثَكُمْ

أَنَّ رَسُولَ اللهِ ﷺ بَالَ قَائِمًا فَلَا تُصَدِّقُوهُ مَا كَانَ يَبُولُ إِلَّا جَالِسًا»