Sahih Bukhari Volume 9, Book 91, Hadith 7024

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، عَنْ مَعْمَرٍ، عَنْ هَمَّامٍ، أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ ـ رضى الله عنه ـ يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ بَيْنَا أَنَا نَائِمٌ رَأَيْتُ أَنِّي عَلَى حَوْضٍ أَسْقِي النَّاسَ، فَأَتَانِي أَبُو بَكْرٍ فَأَخَذَ الدَّلْوَ مِنْ يَدِي لِيُرِيحَنِي، فَنَزَعَ ذَنُوبَيْنِ وَفِي نَزْعِهِ ضَعْفٌ وَاللَّهُ يَغْفِرُ لَهُ، فَأَتَى ابْنُ الْخَطَّابِ فَأَخَذَ مِنْهُ، فَلَمْ يَزَلْ يَنْزِعُ، حَتَّى تَوَلَّى النَّاسُ وَالْحَوْضُ يَتَفَجَّرُ ‏"‏‏

Narrated By Abu Huraira : Allah's Apostle said, "While I was sleeping, I saw myself standing over a tank (well) giving water to the people to drink. Then Abu Bakr came to me and took the bucket from me in order to relieve me and he pulled out one or two full buckets, and there was weakness in his pulling... may Allah forgive him. Then Ibn Al-Khattab took it from him and went on drawing water till the people left (after being satisfied) while the tank was over flowing with water."