Sayyiduna Abdullah bin al-Zubayr (may Allah be pleased with them both) narrates: The Prophet (peace and blessings be upon him) said: "One prayer offered in this mosque of mine is more excellent than a thousand prayers offered in any other mosque, except that the case of al-Masjid al-Haram is different. One prayer offered in al-Masjid al-Haram is more excellent than a hundred prayers offered in this mosque (that is, the Prophet's Mosque)."
Imam Ahmad and Imam al-Bazzar recorded this, and his wording is: The Prophet (peace and blessings be upon him) said: "One prayer offered in this mosque of mine is more excellent than a thousand prayers offered anywhere else, except that the case of al-Masjid al-Haram is different; and one prayer offered in al-Masjid al-Haram is a hundred times more excellent than it."
Imam al-Tabarani recorded this in al-Mu'jam al-Kabir similar to the narration of Imam al-Bazzar. The narrators of Imam Ahmad and Imam al-Bazzar are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الحج / 5858