Musnad Ahmad 5:777

Abu Kamil narrated to us, Zuhayr narrated to us, Abu Ishaq narrated to us, from Harithah ibn al-Mudarrib, from Ali, may Allah be pleased with him. Yahya ibn Adam and Abu al-Nadr narrated to us, they said: Zuhayr narrated to us, from Abu Ishaq, from Harithah ibn Mudarrib, from Ali, may Allah be pleased with him, who said: "When the intensity of battle reddened, and the people met the people, we would protect ourselves with the Messenger of Allah, may Allah bless him and grant him peace. There was not one of us closer to the enemy than him."