Sahih Muslim 2290, 2291 a
Sahl (b. Sa'd) reported:
I heard Allah's Apostle (ﷺ) as saying: I shall go to the Cistern before you and he who comes would drink and he who drinks would never feel thirsty, and there would come to me people whom I would know and who would know me. Then there would be intervention between me and them. Abu Hazim said that Nu'man b. Abu 'Ayyash heard it and I narrated to them this hadith, and said: Is it this that you heard Sahl saying? He said: Yes, and I bear witness to the fact that I heard it from Abu Sa'id Khudri also, but he made this addition that he (the Holy Prophet) would say: They are my followers, and it would be said to him: You do not know what they did after you and I will say to them: Woe to him who changes (his religion) after me.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا يَعْقُوبُ، - يَعْنِي ابْنَ عَبْدِ الرَّحْمَنِ الْقَارِيَّ - عَنْ 
 أَبِي حَازِمٍ، قَالَ سَمِعْتُ سَهْلاً، يَقُولُ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ‏"‏ أَنَا فَرَطُكُمْ،
 عَلَى الْحَوْضِ مَنْ وَرَدَ شَرِبَ وَمَنْ شَرِبَ لَمْ يَظْمَأْ أَبَدًا وَلَيَرِدَنَّ عَلَىَّ أَقْوَامٌ أَعْرِفُهُمْ وَيَعْرِفُونِي
 ثُمَّ يُحَالُ بَيْنِي وَبَيْنَهُمْ ‏"‏ ‏.‏ قَالَ أَبُو حَازِمٍ فَسَمِعَ النُّعْمَانُ بْنُ أَبِي عَيَّاشٍ وَأَنَا أُحَدِّثُهُمْ
 هَذَا الْحَدِيثَ فَقَالَ هَكَذَا سَمِعْتَ سَهْلاً يَقُولُ قَالَ فَقُلْتُ نَعَمْ ‏.‏ 
 قَالَ وَأَنَا أَشْهَدُ، عَلَى أَبِي سَعِيدٍ الْخُدْرِيِّ لَسَمِعْتُهُ يَزِيدُ فَيَقُولُ ‏"‏ إِنَّهُمْ مِنِّي ‏.‏ فَيُقَالُ
 إِنَّكَ لاَ تَدْرِي مَا عَمِلُوا بَعْدَكَ ‏.‏ فَأَقُولُ سُحْقًا سُحْقًا لِمَنْ بَدَّلَ بَعْدِي ‏"‏ ‏.‏