Abu Hanifah and Muhammad maintain that adhan should follow the entry of prayer time, including Fajr, because adhan normally announces an already-entered time and a premature call could mislead listeners.
Abu Yusuf and al-Shafi‘i recognize a pre-dawn Fajr call, relying on reports that Bilal called during the night.
The early call serves to awaken sleepers and alert those taking the pre-dawn meal; true dawn still marks the beginning of Fajr prayer time.
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Bab al-Adhan: The Adhan, Iqamah and Juristic Rulings
Abu Hanifah and Muhammad maintain that adhan should follow the entry of prayer time, including Fajr, because adhan normally announces an already-entered time and a premature call could mislead listeners.
Abu Yusuf and al-Shafi‘i recognize a pre-dawn Fajr call, relying on reports that Bilal called during the night.
The early call serves to awaken sleepers and alert those taking the pre-dawn meal; true dawn still marks the beginning of Fajr prayer time.