Musannaf Ibn Abi Shayba 36:566

Yazid ibn Harun narrated to us, from Hisham ibn Hassan, from Muhammad, from Ubaydah, who said: Ali said: "What is holding back the most wretched of them from coming and killing me? O Allah, I have become weary of them and they have become weary of me, so relieve me of them and relieve them of me."