Hadith 139

Narrated Ibn 'Abbas (RA): Allah's Messenger (ﷺ) said that, "Dawn is of two types; the dawn in which eating is forbidden (for the fasting person) and prayer is permitted and the dawn in which prayer is forbidden i.e. the morning prayer and eating is permitted." [Reported by Ibn Khuzaimah and al-Hakim who (both) graded it Sahih]. al-Hakim reported something similar to the above Hadith from Jabir and added to the type of dawn in which eating is forbidden: "it is spread widely in the horizon," and to the other type: "it has the shape of wolf's tail."