صحيح مسلم
Sahih Muslim
كتاب الفضائل
The Book of Virtues
باب إِثْبَاتِ حَوْضِ نَبِيِّنَا صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَصِفَاتِهِ:
Chapter: The Cistern Of Our Prophet (SAW) And Its Attributes
Hadith 2291
This hadith is listed as number 5969 in Maktaba Shamila
قَالَ : وَأَنَا أَشْهَدُ عَلَى أَبِي سَعِيدٍ الْخُدْرِيِّ لَسَمِعْتُهُ يَزِيدُ ، فَيَقُولُ : إِنَّهُمْ مِنِّي ، فَيُقَالُ : إِنَّكَ لَا تَدْرِي مَا عَمِلُوا بَعْدَكَ ، فَأَقُولُ : سُحْقًا سُحْقًا لِمَنْ بَدَّلَ بَعْدِي .
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.
