Sahih al-Bukhari 6583
Narrated Abu Hazim from Sahl bin Sa`d:
The Prophet (ﷺ) said, "I am your predecessor (forerunner) at the Lake-Fount, and whoever will pass by 
there, he will drink from it and whoever will drink from it, he will never be thirsty. There will come to 
me some people whom I will recognize, and they will recognize me, but a barrier will be placed 
between me and them."
حَدَّثَنَا سَعِيدُ بْنُ أَبِي مَرْيَمَ، حَدَّثَنَا مُحَمَّدُ بْنُ مُطَرِّفٍ، حَدَّثَنِي أَبُو حَازِمٍ، عَنْ سَهْلِ بْنِ سَعْدٍ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏
"‏ إِنِّي فَرَطُكُمْ عَلَى الْحَوْضِ، مَنْ مَرَّ عَلَىَّ شَرِبَ، وَمَنْ شَرِبَ لَمْ يَظْمَأْ أَبَدًا، لَيَرِدَنَّ عَلَىَّ أَقْوَامٌ أَعْرِفُهُمْ وَيَعْرِفُونِي، ثُمَّ يُحَالُ بَيْنِي وَبَيْنَهُمْ ‏"‏‏.‏