Muwatta Imam Malik Book of The Qibla, Hadith 9
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 ﷺ 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)."
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ رَبَاحٍ، وَعُبَيْدِ اللَّهِ بْنِ أَبِي عَبْدِ اللَّهِ، عَنْ أَبِي عَبْدِ اللَّهِ، سَلْمَانَ الأَغَرِّ عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " صَلاَةٌ فِي مَسْجِدِي هَذَا خَيْرٌ مِنْ أَلْفِ صَلاَةٍ فِيمَا سِوَاهُ إِلاَّ الْمَسْجِدَ الْحَرَامَ " .