Sayyiduna Jubayr bin Mut'im (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Prayer in my mosque is more than a thousand prayers in any other mosque, except al-Masjid al-Haram."
Hadith Referenceالمعجم الكبير للطبراني / باب الجيم / 1594