It is narrated from Hazrat Anas (may Allah be pleased with him) that a person asked the Prophet (peace and blessings be upon him) about the time of the Fajr prayer. So the Prophet (peace and blessings be upon him) instructed Hazrat Bilal (may Allah be pleased with him) to establish the prayer at the time of the break of dawn, and the prayer was performed. Then, on the next day, he led the prayer when there was ample light, and said: "Where is the one who asked about the time of the Fajr prayer?" The time for the Fajr prayer is between these two times.