What did the Prophet Muhammad (peace be upon him) say regarding Ibn Um Maktum and Bilal's Adhan?
 Narrated `Abdullah bin `Umar:                     The Prophet said, "Bilal pronounces the Adhan when it is still night (before dawn), so eat and drink till the next Adhan is pronounced (or till you hear Ibn Um Maktum's Adhan)." Ibn Um Maktum was a blind man who would not pronounce the Adhan till he was told that it was dawn.