Narrated Abdullah bin Masud: The Messenger of Allah صلی اللہ علیہ وسلم as saying: The summons (adhan) of Bilal should not restrain one of you from taking a meal shortly before dawn, for he utters adhan or calls (for prayer) so that the man at prayer may return, and the man asleep may get up. Dawn is not (the whiteness) which indicates thus (in perpendicular) - the narrator Musaddad said: Yahya joined his palms (indicating the spread of whiteness vertically - until it indicates thus - and Yahya spread out two ring-fingers of his (demonstrating the spread of whiteness horizontally)l

Aishah reported: Ibn Umm Maktum was the muadhdhin of the Messenger of Allah صلی اللہ علیہ وسلم and he was blind.

Addressing (the people) Samurah bin Jundub reported the Messenger of Allah صلی اللہ علیہ وسلم as saying: The adhan (call to prayer) of Bilal should not prevent you from taking a meal shortly before dawn, not does the whiteness of horizon (before dawn) in this way (vertically) until it spreads out horizontally.