Sahih Bukhari Volume 2, Book 25, Hadith 1636

حَدَّثَنَا إِسْحَاقُ، حَدَّثَنَا خَالِدٌ، عَنْ خَالِدٍ الْحَذَّاءِ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم جَاءَ إِلَى السِّقَايَةِ، فَاسْتَسْقَى، فَقَالَ الْعَبَّاسُ يَا فَضْلُ اذْهَبْ إِلَى أُمِّكَ، فَأْتِ رَسُولَ اللَّهِ صلى الله عليه وسلم بِشَرَابٍ مِنْ عِنْدِهَا‏.‏ فَقَالَ ‏"‏ اسْقِنِي ‏"‏‏.‏ قَالَ يَا رَسُولَ اللَّهِ إِنَّهُمْ يَجْعَلُونَ أَيْدِيَهُمْ فِيهِ‏.‏ قَالَ ‏"‏ اسْقِنِي ‏"‏‏.‏ فَشَرِبَ مِنْهُ، ثُمَّ أَتَى زَمْزَمَ، وَهُمْ يَسْقُونَ وَيَعْمَلُونَ فِيهَا، فَقَالَ ‏"‏ اعْمَلُوا، فَإِنَّكُمْ عَلَى عَمَلٍ صَالِحٍ ـ ثُمَّ قَالَ ـ لَوْلاَ أَنْ تُغْلَبُوا لَنَزَلْتُ حَتَّى أَضَعَ الْحَبْلَ عَلَى هَذِهِ ‏"‏‏.‏ ـ يَعْنِي عَاتِقَهُ ـ وَأَشَارَ إِلَى عَاتِقِهِ‏

Narrated By Ibn Abbas : Allah's Apostle came to the drinking place and asked for water. Al-Abbas said, "O Fadl! Go to your mother and bring water from her for Allah's Apostle." Allah's Apostle said, "Give me water to drink." Al-Abbas said, "O Allahs Apostle! The people put their hands in it." Allah's Apostle again said, 'Give me water to drink. So, he drank from that water and then went to the Zam-zam (well) and there the people were offering water to the others and working at it (drawing water from the well). The Prophet then said to them, "Carry on! You are doing a good deed." Then he said, "Were I not afraid that other people would compete with you (in drawing water from Zam-zam), I would certainly take the rope and put it over this (i.e. his shoulder) (to draw water)." On saying that the Prophet pointed to his shoulder.