Sahih al-Bukhari 1637
Sahih al-Bukhari · Book 25: Hajj (Pilgrimage) · What is said about Zamzam (water)
Narrated Ibn `Abbas:
حَدَّثَنَا مُحَمَّدٌ ـ هُوَ ابْنُ سَلاَمٍ ـ أَخْبَرَنَا الْفَزَارِيُّ ، عَنْ عَاصِمٍ ، عَنِ الشَّعْبِيِّ ، أَنَّ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ حَدَّثَهُ قَالَ سَقَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم مِنْ زَمْزَمَ فَشَرِبَ وَهُوَ قَائِمٌ. قَالَ عَاصِمٌ فَحَلَفَ عِكْرِمَةُ مَا كَانَ يَوْمَئِذٍ إِلاَّ عَلَى بَعِيرٍ .
I gave Zamzam water to Allah's Messenger (ﷺ) and he drank it while standing. `Asim (a sub-narrator) said that `Ikrima took the oath that on that day the Prophet (ﷺ) had not been standing but riding a camel.