Compiled by Imam Yahya ibn Sharaf al-Nawawi
وعن ابن عمر رضى الله عنهما قال:كنا نأكل على عهد رسول الله صلى الله عليه وسلم ونحن نمشى ، ونشرب ونحن قيام.((رواه الترمذي))
During the lifetime of the Messenger of Allah (ﷺ) we would eat while walking and would drink while standing.[At- Tirmidhi].