Narrated Anas bin Malik: I saw Allah's Messenger (ﷺ) at the 'time when the `Asr prayer was due. Then the people were searching for water for ablution but they could not find any. Then some water was brought to Allah's Messenger (ﷺ) and he placed his hand in the pot and ordered the people to perform the ablution with the water. I saw water flowing from underneath his fingers and the people started performing the ablution till all of them did it.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ أَنَّهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم وَحَانَتْ صَلاَةُ الْعَصْرِ، فَالْتُمِسَ الْوَضُوءُ فَلَمْ يَجِدُوهُ فَأُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِوَضُوءٍ، فَوَضَعَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَدَهُ فِي ذَلِكَ الإِنَاءِ، فَأَمَرَ النَّاسَ أَنْ يَتَوَضَّئُوا مِنْهُ، فَرَأَيْتُ الْمَاءَ يَنْبُعُ مِنْ تَحْتِ أَصَابِعِهِ، فَتَوَضَّأَ النَّاسُ حَتَّى تَوَضَّئُوا مِنْ عِنْدِ آخِرِهِمْ.
sunnah.com