Musnad Ahmad 938:29

Uthman ibn Umar narrated to us, Ibn Abi Dhi'b narrated to us, from Uqbah ibn Abd al-Rahman, from Muhammad ibn Abd al-Rahman ibn Thawban, from Zayd ibn Thabit, that the Messenger of Allah (may Allah bless him and grant him peace) said: "May Allah curse the Jews; they took the graves of their prophets as places of worship."