The Messenger of Allah ﷺ saw me urinating while standing and said, "Umar, do not urinate standing up." After that, I never urinated standing up again.
حدثنا محمد بن يحيى حدثنا عبد الرزاق حدثنا ابن جريج عن عبد الكريم بن أبي أمية عن نافع عن ابن عمر
رآني رسول الله ﷺ وأنا أبول قائما فقال يا عمر لا تبل قائما فما بلت قائما بعد
No references are available.
Its isnad is daif. Bayhaqi (1/102) narrated it through the route of Abdul-Razzaq, and Busiri said, "This is a daif isnad. Abdul-Kareem's weakness is agreed upon."