Sunan Ibn Majah 308
سنن ابن ماجه#308Da'ifحَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَبْدِ الْكَرِيمِ بْنِ أَبِي أُمَيَّةَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، عَنْ عُمَرَ، قَالَ رَآنِي رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ وَأَنَا أَبُولُ قَائِمًا فَقَالَ " يَا عُمَرُ لاَ تَبُلْ قَائِمًا " . فَمَا بُلْتُ قَائِمًا بَعْدُ .
It was narrated that 'Umar said:"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
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: 1:42