Said bin al-Musayyab reported that Ali and Uthman (RA) met at Usfan; and Uthman used to forbid (people) from performing Tamattu and Umrah (during the period of Hajj), whereupon Ali said: What is your opinion about a matter which the Messenger of Allah ﷺ did, but you forbid it? Thereupon Uthman said: You leave us alone, whereupon he (Ali) said: I cannot leave you alone. When Ali saw this, he put on Ihram for both of them together (both for Hajj and Umrah).