(53) باب فِي الْحَوْضِ
Abu Hazim added:
An-Nu`man bin Abi `Aiyash, on hearing me, said. "Did you hear this from Sahl?" I said, "Yes." He said, " I bear witness that I heard Abu Sa`id Al-Khudri saying the same, adding that the Prophet (ﷺ) said: 'I will say: They are of me (i.e. my followers). It will be said, 'You do not know what they innovated (new things) in the religion after you left'. I will say, 'Far removed, far removed (from mercy), those who changed (their religion) after me."
Reference: Sahih al-Bukhari 6584
In-book reference: Book 81, Hadith 172
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 76, Hadith 585