It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "A man's prayer in his house is equal to one prayer; his prayer in the mosque of his neighbourhood is equal to twenty-five prayers; his prayer in the congregational mosque where the Jumu'ah is established is equal to five hundred prayers; his prayer in al-Masjid al-Aqsa is equal to fifty thousand prayers; his prayer in the Mosque of the Ka'bah (al-Masjid al-Haram) is equal to one hundred thousand prayers; and his prayer in this mosque of mine (the Prophet's Mosque) is equal to fifty thousand prayers."
This hadith is not narrated from Sayyiduna Anas (may Allah be pleased with him) except with this chain; Hisham bin Ammar (may Allah have mercy on him) is alone in narrating it.
Hadith Referenceالمعجم الأوسط / باب الميم / 7008
Hadith Gradingمحدثین:منكر، رجاله مجهولون
Hadith Takhrij«قال ابن ماكولا: الحديث منكر ورجاله مجهولون «فتح الباري شرح صحيح البخاري لابن رجب، ج 2، ص 580»» «قال بدر الدين العيني: فيه أبو الخطاب الدمشقي يحتاج إلى الكشف «عمدة القاري شرح صحيح البخاري، ج 7، ص 255»» «أخرجه ابن ماجه فى «سننه» برقم: 1413»