Maliks Muwatta Book 14, Hadith Number 9.
Section : Concerning the Mosque of the Prophet, may Allah Bless Him and Grant Him Peace.
Yahya related to me from Malik from Zayd ibn Rabah and Ubaydullah ibn Abi Abdullah Salman al-Agharr from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, “A prayer in this mosque of mine is better than a thousand prayers in any other mosque, except the Masjid al-Haram (in Makka).”