Musnad Ahmad 30:996

'Abd al-Razzaq ibn Hammam narrated to us, Ma'mar narrated to us, from Hammam ibn Munabbih, who said: This is what Abu Hurayrah narrated to us from the Messenger of Allah, may Allah bless him and grant him peace, who said: "We are the last, the first on the Day of Resurrection, except that they were given the Book before us, and we were given it after them. So this is their day which was ordained for them, but they differed concerning it. Then Allah guided us to it, so they are followers to us in it: the Jews tomorrow, and the Christians the day after tomorrow."