Musannaf Ibn Abi Shayba 3:6294

Abu Mu'awiyah narrated to us, from al-A'mash, from Ibrahim, from al-Aswad, from Abdullah, who said: Seek the Night of Decree in the seven that remain, seek it in the nine that remain, seek it in the eleven that remain, [and] the morning of Badr. For the sun rises every day between the two horns of the devil, except for the morning of Badr, for it rises white, having no rays.