Musnad Ahmad 2:138

Rawh and Mu'ammal narrated to us, they said: Sufyan al-Thawri narrated to us, from Abu al-Zubayr, from Jabir ibn Abdullah, that Umar ibn al-Khattab said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "If I live, I will surely expel the Jews and the Christians from the Arabian Peninsula, until I do not leave in it anyone except a Muslim."