Sahih Al Bukhari Hadith Number 1190

Narrated Abu Huraira: Allah’s Messenger (peace be upon him) said, “One prayer in my Mosque is better than one thousand prayers in any other mosque excepting Al-Masjid-AI-Haram.”

20  Virtues of Prayer at Masjid Makkah and Madinah
Hadith number 1190
Volume no 2
Chapter: 1 ( The superiority of offering As-Salat in the Mosque of Makkah and Al-Madina)