Silsilat al-Ahadith al-Sahihah

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) said: "There are two types of dawn: (1) The (true) dawn, in which eating (the pre-dawn meal) becomes forbidden and performing the (Fajr) prayer becomes permissible; and (2) The (false) dawn, in which performing the (Fajr) prayer is forbidden and eating (the pre-dawn meal) is permissible."