"Now, if there was more revelation (i.e., Hadith), then the Prophet’s duty should have been to transmit that as well, in a fashion similar to that of the Quran. But neither did he order it to be written down anywhere, nor did he oversee its memorization, nor did he compile some sort of collection of it, nor did he make any sort of accommodation whatsoever for its preservation. Rather even if someone, out of good will, attempted to record anything on his own, he stopped them saying “Don’t record anything of me other than the Quran,” – Sahih Muslim"