The traditionist was not convinced of his genuineness, even though Imam Tirmidhi recited the traditions to him, so Imam Tirmidhi asked him to recite some other traditions. The traditionist recited forty traditions which Imam Tirmidhi repeated without making a single error, thus showing his remarkable power of committing traditions to memory.
Moulana Rashid Ahmad Gangohi (d.1323 A.H.), a commentator on the Jami' said that Imam Tirmidhi was born blind. This opinion is erroneous since al-Dhahabi (d.748 A.9) and the majority of the scholars agree that his blindness occurred during the latter portion of his life and he remained blind for two years. Hence he was commonly referred to as al-Darir (blind). His blindness is usually attributed to his weeping over Imam Bukhari's death (d.256 A.H.) or his excessive weeping for the fear of Allah.