It is narrated from Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "One prayer in this mosque of mine is better than a thousand prayers in all other mosques except al-Masjid al-Haram, and one prayer in al-Masjid al-Haram is better than a thousand prayers in my mosque."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13865