Narrated Salim:

Jabir said "On the day of Al-Hudaibiya, the people felt thirsty and Allah's Messenger (ﷺ) had a utensil containing water. He performer ablution from it and then the people came towards him. Allah's Apostle said, 'What is wrong with you?' The people said, 'O Allah's Messenger (ﷺ)! We haven't got any water to perform ablution with or to drink, except what you have in your utensil.' So the Prophet (ﷺ) put his hand in the utensil and the water started spouting out between his fingers like springs. So we drank and performed ablution." I said to Jabir, "What was your number on that day?" He replied, "Even if we had been one hundred thousand, that water would have been sufficient for us. Anyhow, we were 1500.'

حَدَّثَنَا يُوسُفُ بْنُ عِيسَى، حَدَّثَنَا ابْنُ فُضَيْلٍ، حَدَّثَنَا حُصَيْنٌ، عَنْ سَالِمٍ، عَنْ جَابِرٍ ـ رضى الله عنه ـ قَالَ عَطِشَ النَّاسُ يَوْمَ الْحُدَيْبِيَةِ وَرَسُولُ اللَّهِ صلى الله عليه وسلم بَيْنَ يَدَيْهِ رَكْوَةٌ، فَتَوَضَّأَ مِنْهَا، ثُمَّ أَقْبَلَ النَّاسُ نَحْوَهُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَا لَكُمْ ‏"‏‏.‏ قَالُوا يَا رَسُولَ اللَّهِ لَيْسَ عِنْدَنَا مَاءٌ نَتَوَضَّأُ بِهِ، وَلاَ نَشْرَبُ إِلاَّ مَا فِي رَكْوَتِكَ‏.‏ قَالَ فَوَضَعَ النَّبِيُّ صلى الله عليه وسلم يَدَهُ فِي الرَّكْوَةِ، فَجَعَلَ الْمَاءُ يَفُورُ مِنْ بَيْنِ أَصَابِعِهِ كَأَمْثَالِ الْعُيُونِ، قَالَ فَشَرِبْنَا وَتَوَضَّأْنَا‏.‏ فَقُلْتُ لِجَابِرٍ كَمْ كُنْتُمْ يَوْمَئِذٍ قَالَ لَوْ كُنَّا مِائَةَ أَلْفٍ لَكَفَانَا، كُنَّا خَمْسَ عَشْرَةَ مِائَةً‏.‏
Reference : Sahih al-Bukhari 4152
In-book reference : Book 64, Hadith 196
USC-MSA web (English) reference : Vol. 5, Book 59, Hadith 473
  (deprecated numbering scheme)