Musnad Ahmad 2:120

'Abd al-Razzaq narrated to us, Ibn Jurayj informed us, Abu al-Zubayr informed me that he heard Jabir ibn 'Abd Allah saying: 'Umar ibn al-Khattab informed me that he heard the Messenger of Allah, 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 none but a Muslim."