Sahih Bukhari Volume 5, Book 62, Hadith 3678

حَدَّثَنِي أَحْمَدُ بْنُ سَعِيدٍ أَبُو عَبْدِ اللَّهِ، حَدَّثَنَا وَهْبُ بْنُ جَرِيرٍ، حَدَّثَنَا صَخْرٌ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ بَيْنَمَا أَنَا عَلَى بِئْرٍ أَنْزِعُ مِنْهَا جَاءَنِي أَبُو بَكْرٍ وَعُمَرُ، فَأَخَذَ أَبُو بَكْرٍ الدَّلْوَ، فَنَزَعَ ذَنُوبًا أَوْ ذَنُوبَيْنِ وَفِي نَزْعِهِ ضَعْفٌ، وَاللَّهُ يَغْفِرُ لَهُ، ثُمَّ أَخَذَهَا ابْنُ الْخَطَّابِ مِنْ يَدِ أَبِي بَكْرٍ، فَاسْتَحَالَتْ فِي يَدِهِ غَرْبًا، فَلَمْ أَرَ عَبْقَرِيًّا مِنَ النَّاسِ يَفْرِي فَرِيَّهُ، فَنَزَعَ حَتَّى ضَرَبَ النَّاسُ بِعَطَنٍ ‏"‏‏.‏ قَالَ وَهْبٌ الْعَطَنُ مَبْرَكُ الإِبِلِ، يَقُولُ حَتَّى رَوِيَتِ الإِبِلُ فَأَنَاخَتْ‏.‏

Narrated By Abdullah bin Umar : Allah's Apostle said. "While (in a dream), I was standing by a well, drawing water from it. Abu Bakr and 'Umar came to me. Abu Bakr took the bucket (from me) and drew one or two buckets of water, and there was some weakness in his drawing. May Allah forgive him. Then Ibn Al-Khattab took the bucket from Abu Bakr, and the bucket turned into a very large one in his hands. I had never seen such a mighty person amongst the people as him in performing such hard work. He drew so much water that the people drank to their satisfaction and watered their camels." (Wahab, a sub-narrator said, "till their camels drank and knelt down.")