Hammam bin Munabbih (may Allah have mercy on him) says that Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrated from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "We are the last to come in this world and the foremost of all on the Day of Resurrection, except only that they were given the Book before us and we after them. This day, Jumu'ah, was made obligatory upon them. They differed about it, so Allah Almighty guided us to this day. They now follow us regarding this day: the Jews a day after and the Christians two days after."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5569