Musnad Ahmad 33:599

Musa narrated to us, Ibn Lahi'ah narrated to us, from Abu al-Zubayr, from Jabir, that Umar ibn al-Khattab informed him that he heard the Prophet, peace and blessings of Allah be upon him, saying: "I will surely expel the Jews and the Christians from the Arabian Peninsula, until I leave nothing in it except a Muslim."