ʿAlī saw the Prophet ﷺ drink standing up

Ali came to the gate of the courtyard (of the Mosque) and drank (water) while he was standing and said, "Some people dislike to drink while standing, but I saw the Prophet ﷺ doing (drinking water) as you have seen me doing now."  

أَتَى عَلِيٌّ ؓ عَلَى باب الرَّحَبَةِ فَشَرِبَ قَائِمًا فَقَالَ: إِنَّ نَاسًا يَكْرَهُ أَحَدُهُمْ أَنْ يَشْرَبَ وَهْوَ قَائِمٌ، وَإِنِّي رَأَيْتُ النَّبِيَّ ﷺ فَعَلَ كَمَا رَأَيْتُمُونِي فَعَلْتُ۔  

ʿAli offered the Zuhr prayer and then sat down in the wide courtyard (of the Mosque) of Kufa in order to deal with the affairs of the people till the ʿAsr prayer became due. Then water was brought to him and he drank of it, washed his face, hands, head and feet. Then he stood up and drank the remaining water while he was standing. and said, "Some people dislike to drink water while standing thought the Prophet did as I have just done."  

أَنَّهُ صَلَّى الظُّهْرَ ثُمَّ قَعَدَ فِي حَوَائِجِ النَّاسِ فِي رَحَبَةِ الْكُوفَةِ حَتَّى حَضَرَتْ صَلاَةُ الْعَصْرِ ثُمَّ أُتِيَ بِمَاءٍ فَشَرِبَ وَغَسَلَ وَجْهَهُ وَيَدَيْهِ وَذَكَرَ رَأْسَهُ وَرِجْلَيْهِ ثُمَّ قَامَ فَشَرِبَ فَضْلَهُ وَهْوَ قَائِمٌ ثُمَّ قَالَ إِنَّ نَاسًا يَكْرَهُونَ الشُّرْبَ قَائِمًا وَإِنَّ النَّبِيَّ ﷺ صَنَعَ مِثْلَ مَا صَنَعْتُ  

The Prophet ﷺ drank Zamzam (water) while standing.  

شَرِبَ النَّبِيُّ ﷺ قَائِمًا مِنْ زَمْزَمَ