I saw ‘Ali ؓ drinking whilst standing. I said to him: Are you drinking whilst standing? He said: If I drink whilst standing I saw the Messenger of Allah ﷺ drinking whilst standing and if I drink whilst sitting, I saw the Messenger of Allah ﷺ drinking whilst sitting.
إِنْ أَشْرَبْ قَائِمًا فَقَدْ رَأَيْتُ رَسُولَ اللهِ ﷺ يَشْرَبُ قَائِمًا وَإِنْ أَشْرَبْ قَاعِدًا فَقَدْ رَأَيْتُ رَسُولَ اللهِ ﷺ يَشْرَبُ قَاعِدًا