Riyad as-SalihinChapter 2Hadith 89
Full Sharh — Riyad as-Salihin 89
وعن ابن عمر رضى الله عنهما قال:كنا نأكل على عهد رسول الله صلى الله عليه وسلم ونحن نمشى ، ونشرب ونحن قيام.((رواه الترمذي))
English Translation
Ibn 'Umar (May Allah be pleased with them) reported:: During the lifetime of the Messenger of Allah (ﷺ) we would eat while walking and would drink while standing..
Source
Riyad as-Salihin(رياض الصالحين)
The Book About the Etiquette of Eating
Hadith Number
89