Musnad Abu Ya'la al-Mawsili 217:24

Ya'qub ibn Ibrahim narrated to us, Abu 'Asim narrated to us, from Ibn Jurayj, he said: I heard Nafi' narrating from Ibrahim ibn 'Abdullah ibn Ma'bad ibn 'Abbas, from Maymunah, that she heard the Messenger of Allah (may Allah bless him and grant him peace) saying: "A prayer in this mosque of mine is better than a thousand prayers in what is other than it, except for the Sacred Mosque (al-Masjid al-Haram)."