Jabir reported that the people were stricken with thirst on the Day of Hudaybiyyah while the Messenger of Allah ﷺ had a small water vessel in front of him from which he performed ablution. The people then came toward him, and the Messenger of Allah ﷺ asked, "What is the matter with you?"They replied, "Messenger of Allah, we have no water for ablution or to drink except what is in your vessel."The Prophet ﷺ then placed his hand in the vessel, and water began to gush forth from between his fingers like springs. So we drank and performed ablution.I asked Jabir, "How many were you that day?"He answered, "Even if we had been a hundred thousand, it would have sufficed us. We were fifteen hundred."
عطش الناس يوم الحديبية، ورسول الله ﷺ بين يديه ركوة، فتوضأ منها، ثم أقبل الناس نحوه فقال رسول الله ﷺ: ما لكم؟ قالوا: يا رسول الله ليس عندنا ماء نتوضأ به، ولا تشرب إلا ما في ركوتك، قال: فوضع النبي ﷺ يده في الركوة، فجعل الماء يفور من بين أصابعه كأمثال العيون، قال: فشربنا وتوضأنا. فقلت لجابر: كم كنتم يومئذ؟ قال لو كنا مائة ألف لكفانا، كنا خمس عشرة مائة.
Bukhari related it in Maghazi (4152) and Muslim in Imarah (73:1856), both through Husayn (who is Ibn Abdul-Rahman), from Salim bin Abu Jaad, from Jabir, who mentioned it.Regarding his statement, "We were fifteen hundred," there is a report from Amr bin Dinar, from Jabir, saying, "We were one thousand four hundred." The two can be reconciled by saying that they were more than one thousand four hundred. Whoever said one thousand five hundred rounded the fraction up, and whoever said one thousand four hundred dropped it.As for the statement of Abdullah bin Abu Awfa, "One thousand three hundred," it can be understood as referring only to what he himself observed, while others were aware of the additional number. Alternatively, the number he mentioned may refer to those who set out from Madinah at the very start, with the rest catching up with them later. Or the number he mentioned may refer to the count of fighting men, with the additional number consisting of followers such as servants, women, and children who had not yet reached puberty.