It is narrated from Sayyiduna Bilal bin al-Harith (may Allah be pleased with him); he states that the Messenger of Allah (peace and blessings be upon him) said: "Ramadan in Madinah al-Munawwarah (spending the month / fasting it) is more virtuous than a thousand Ramadans in other cities, and Friday in Madinah al-Munawwarah (offering the Friday prayer) is better than a thousand Fridays in other cities."
Al-Tabarani (may Allah have mercy on him) recorded it in al-Mu'jam al-Kabir, and its chain contains a narrator named Kathir bin Abdullah, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 4800M