It was narrated from Zadhan that `Ali bin Abi Talib (رضي الله عنه) drank whilst standing and the people looked at him and found that strange. ‘Ali (رضي الله عنه) said:
Why are you looking at me like that? If I drink whilst standing. I saw the Messenger of Allah (ﷺ) drink whilst standing, and if I drink whilst sitting, I saw the Messenger of Allah (ﷺ) drink whilst sitting