Hadith 31-295

وَبِإِسْنادِهِ عَنْ عَلِيِ‏ عَلَيْهِ السَّلامُ، أَنَّهُ شَرِبَ قائِماً وَقالَ: هكَذا رَأَيْتُ النَّبِيِ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ فَعَلَ.

According to the same documentation, it is narrated that Ali (a.s.) was seen drinking water while he was standing up and said, “I saw the Prophet (S) do this.”