'Abdur-Rahmaan ibn Mahdee dictated 20,000 hadeeth to us from memory.
Tag: dictate
He was capable of dictating it all from memory
Abu 'Ali as-Sadafee رحمه الله said [about Abu Bakr al-Hamawee رحمه الله]: He was pious, and an ascetic. As for [his knowledge of] fiqh, then it used to be said
Did not make a single mistake
Ishaaq ibn Raahawayh dictated 11,000 hadeeth to us from memory. He then read them (what he had dictated) to us and [found he] had not made a single mistake [in what he had dictated to us].