Anas b. Malik reported: I saw Allah's Messenger (ﷺ) during the time of the afternoon prayer and the people asking for water for performing ablution which they did not find. (A small quantity) of water was brought to Allah's Messenger (ﷺ) and he placed his hand in that vessel and commanded people to perform ablution. I saw water spouting from his fingers and the people performing ablution until the last amongst them performed it.
Source: sunnah.com
Other translations
Arabic
وَحَدَّثَنِي إِسْحَاقُ بْنُ مُوسَى الأَنْصَارِيُّ، حَدَّثَنَا مَعْنٌ، حَدَّثَنَا مَالِكٌ، ح وَحَدَّثَنِي أَبُو الطَّاهِرِ أَخْبَرَنَا ابْنُ وَهْبٍ، عَنْ مَالِكِ بْنِ أَنَسٍ، عَنْ إِسْحَاقَ بْنِ عَبْدِ اللَّهِ بْنِ أَبِي طَلْحَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم وَحَانَتْ صَلاَةُ الْعَصْرِ فَالْتَمَسَ النَّاسُ الْوَضُوءَ فَلَمْ يَجِدُوهُ فَأُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِوَضُوءٍ فَوَضَعَ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي ذَلِكَ الإِنَاءِ يَدَهُ وَأَمَرَ النَّاسَ أَنْ يَتَوَضَّئُوا مِنْهُ - قَالَ - فَرَأَيْتُ الْمَاءَ يَنْبُعُ مِنْ تَحْتِ أَصَابِعِهِ فَتَوَضَّأَ النَّاسُ حَتَّى تَوَضَّئُوا مِنْ عِنْدِ آخِرِهِمْ .
sunnah.com