Sunan Ibn Majah 307
سنن ابن ماجه#307Sahihحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، وَسُوَيْدُ بْنُ سَعِيدٍ، وَإِسْمَاعِيلُ بْنُ مُوسَى السُّدِّيُّ، قَالُوا حَدَّثَنَا شَرِيكٌ، عَنِ الْمِقْدَامِ بْنِ شُرَيْحِ بْنِ هَانِئٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ مَنْ حَدَّثَكَ أَنَّ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ بَالَ قَائِمًا فَلاَ تُصَدِّقْهُ أَنَا رَأَيْتُهُ يَبُولُ قَاعِدًا .
It was narrated that 'Aishah said:"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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 1:41