Sunan Ibn Majah, Volume 4, Book 32, Hadith 3619 (DarusSalam) ⓘ
It was narrated that Ibn ‘Umar said: “The Prophet forbade putting on sandals whilst standing.”
حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، قَالَ نَهَى النَّبِيُّ ـ صلى الله عليه وسلم ـ أَنْ يَنْتَعِلَ الرَّجُلُ قَائِمًا .
also referenced under: Hadith 3619 (Reference) & Book 32, Hadith 3750 (In-Book)