Nafi' narrates from Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Praying in this mosque of mine is more virtuous than a thousand prayers offered in other mosques, except al-Masjid al-Haram."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 10277