The Book of Prayers (Kitab Al-Salat) 
Muslim :: Book 4 : Hadith 743
A'isha reported: Ibn Umm Maktum used to pronounce Adhan at the behest of the Messenger of Allah (may peace be upon him) (despite the fact) that he was blind.
The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 743
A'isha reported: Ibn Umm Maktum used to pronounce Adhan at the behest of the Messenger of Allah (may peace be upon him) (despite the fact) that he was blind.