Narrated Anas:On the day (of the battle) of Uhad when (some) people retreated and left the Prophet, I saw `Aisha bint Abu Bakr and Um Sulaim, with their robes tucked up so that the bangles around their ankles were visible hurrying with their water skins (in another narration it is said, "carrying the water skins on their backs"). Then they would pour the water in the mouths of the people, and return to fill the water skins again and came back again to pour water in the mouths of the people.
حَدَّثَنَا أَبُو مَعْمَرٍ، حَدَّثَنَا عَبْدُ الْوَارِثِ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ لَمَّا كَانَ يَوْمُ أُحُدٍ انْهَزَمَ النَّاسُ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ وَلَقَدْ رَأَيْتُ عَائِشَةَ بِنْتَ أَبِي بَكْرٍ وَأُمَّ سُلَيْمٍ وَإِنَّهُمَا لَمُشَمِّرَتَانِ أَرَى خَدَمَ سُوقِهِمَا، تَنْقُزَانِ الْقِرَبَ ـ وَقَالَ غَيْرُهُ تَنْقُلاَنِ الْقِرَبَ ـ عَلَى مُتُونِهِمَا، ثُمَّ تُفْرِغَانِهِ فِي أَفْوَاهِ الْقَوْمِ، ثُمَّ تَرْجِعَانِ فَتَمْلآنِهَا، ثُمَّ تَجِيئَانِ فَتُفْرِغَانِهَا فِي أَفْوَاهِ الْقَوْمِ.
Bukhari
Fighting for the Cause of Allah (Jihaad) • Hadith 95