Hadith.1934 - Asim ibn Humayd narrated from Abu Basir Layth al-Muradi, who said: "I asked Abu Abdullah عليه السلام, 'When does food become forbidden for the fasting person, and when does the time for the Fajr prayer begin?' Imam عليه السلام said to me: 'When the dawn spreads and appears like a white cloth, at that point food becomes forbidden for the fasting person, and the time for the Fajr prayer begins.' I said: 'Aren't we still within the time until the sun's rays appear?' Imam عليه السلام said: 'Far from it! Where are you going with this? That is the prayer of children!'"