Sahih al-Bukhari 3184

It is related that al-Bara' said, "When the Prophet, may Allah bless him and grant him peace, wanted to go on 'umra, he sent to the people of Makka to ask their permission to enter Makka. They made a stipulation that he would only remain there for three days and that no one would enter it except with weapons sheathed, and that he would not invite any of them [to Islam]." He said, "So 'Ali ibn Abi Talib began to write the stipulations between them, and he wrote, 'This is what Muhammad, the Messenger of Allah, may Allah bless him and grant him peace, agrees to.' They said, 'If we knew that you were the Messenger of Allah, we would not have prevented you and we would have offered allegiance to you. Rather write, "This is Muhammad ibn 'Abdullah decides."' He said, 'By Allah, I am Muhammad ibn 'Abdullah, and, by Allah, I am the Messenger of Allah.' He did not write." He said, "So he said to 'Ali, 'Rub out "Messenger of Allah".' 'Ali said, 'By Allah, I will never rub it out!' He said, 'Show it to me.'" He said, "He showed it to him and the Prophet, may Allah bless him and grant him peace, rubbed it out with his hand. When he had entered Makka and the days had passed, they went to 'Ali and said, 'Tell your companion to depart.' He mentioned that to the Messenger of Allah, may Allah bless him and grant him peace, and he said, 'Yes,' and then departed."