ENOfficial
Ibn 'Abbas told that when he brought the Prophet (ﷺ) a bucket of Zamzam water he drank it while standing. (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَن ابْن عَبَّاس قَالَ: أَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِدَلْوٍ مِنْ مَاءِ زَمْزَمَ فَشَرِبَ وَهُوَ قَائِمٌ
sunnah.com