Musnad Ahmad 33:579

Husayn, meaning Ibn Muhammad, and Abd al-Jabbar ibn Muhammad al-Khattabi narrated to us, they said: Ubayd Allah, meaning Ibn Amr al-Ruqqi, narrated to us, from Abd al-Karim, from Ata, from Jabir, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "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). And a prayer in the Sacred Mosque is better than a hundred thousand prayers." Husayn said: "In what is other than it."