The Messenger of Allah ﷺ said, "Prayer in this mosque of mine is better than prayer in any other mosque, except the Sacred Mosque."
حدثنا محمد بن عبيد حدثنا عبد الملك عن عطاء
قال رسول الله ﷺ إن الصلاة في مسجدي هذا أفضل من الصلاة فيما سواه من المساجد إلا المسجد الحرام
Its isnad is sahih. Abdul-Malik is Ibn Abu Sulayman Arzami. Ataa is Ibn Abu Rabah. The hadith has already appeared through the narration of Abdul-Malik from Ataa at 4838, and through other routes from Nafi from Ibn Umar at 4646, 5153, 5155, 5358, 5778.