Drinking Zamzam while standing

He said: I gave the Messenger of Allah ﷺ Zamzam water to drink, and he drank while standing.

Asim said: Ikrimah swore that on that day he was only on a camel.

قَالَ: سَقَيْتُ رَسُولَ اللَّهِ ﷺ مِنْ زَمْزَمَ، فَشَرِبَ وَهُوَ قَائِمٌ.

قَالَ عَاصِمٌ: فَحَلَفَ عِكْرِمَةُ مَا كَانَ يَوْمَئِذٍ إِلاَّ عَلَى بَعِيرٍ.

Anas used to breathe twice or thrice in the vessel (while drinking) and used to say that the Prophet; used to take three breaths while drinking.

كَانَ أَنَسٌ يَتَنَفَّسُ فِي الإِنَاءِ مَرَّتَيْنِ أَوْ ثَلاَثًا وَزَعَمَ أَنَّ النَّبِيَّ ﷺ كَانَ يَتَنَفَّسُ ثَلاَثًا