The Messenger of Allah said: "Eat and drink, and do not be disturbed by the rising glow, eat and drink until the redness appears to you on the horizon."
Jami` at-Tirmidhi Book 8, Hadith 24
← Previous Hadith (Another chain) except that he said: "About the length for reciting fifty Ayahs."

Jami` at-Tirmidhi Book 8, Hadith 23 Next Hadith → the Messenger of Allah said: "Do not let the Adhan of Bilal prevent you from your Sahar, nor the drawn out Fajr, but the Fajr that spreads on the horizon."

Jami` at-Tirmidhi Book 8, Hadith 25