Yahya related to me from Malik from Ismail ibn Abi Hakim that he heard Umar ibn Abd al-Aziz say, "One of the last things that the Messenger of Allah, may Allah bless him and grant him peace, said was, 'May Allah fight the jews and the christians. They took the graves of their Prophets as places of prostration . Two deens shall not co-exist in the land of the Arabs.' "