Muhammad bin Sahl bin Askr محمد بن سهل بن عسكر · The Book on Military Expeditions

"Umar bin Al-Khattab informed me that he heard the Messenger of Allah (ﷺ) say: 'I will expel the Jews and the Christians from the Arabian Peninsula, and I will not leave anyone in it except a Muslim." This Hadith is Hasan Sahih.