Musnad Abu Ya'la al-Mawsili 150:345

Narrated to us Muhammad ibn al-Minhal, the brother of Hajjaj; narrated to us Abu 'Awanah, from Qatadah, from Zurarah, from Sa'd ibn Hisham, from 'Aishah, from the Prophet, peace be upon him, who said: "The two rak'ahs before the dawn are better than the world and what is in it."