Talq bin Ali narrated that :
The Messenger of Allah (ﷺ) 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."
Samurah bin Jundub narrated that :
the Messenger of Allah (ﷺ) 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."