Musnad Abu Ya'la al-Mawsili 106:60

Muhammad ibn Bashar narrated to us, Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Abu Ishaq, who said: I heard al-Bara' say: When the Messenger of Allah (peace be upon him) made peace with the people of Makkah, Ali wrote a document between them. He wrote: "Muhammad, the Messenger of Allah." The polytheists said: "Do not write 'Muhammad, the Messenger of Allah.' If you were the Messenger of Allah, we would not have fought you." He said to Ali: "Erase it." Ali said: "I am not the one to erase it." So the Messenger of Allah (peace be upon him) erased it with his own hand. He made peace with them on the condition that he and his companions would enter it for three days, and they would not enter it except with the *jalban* of weapons. They asked him: "What is the *jalban* of weapons?" He said: "The scabbard and what is in it."