Sa'id b. al-Musayyab reported that 'Ali and 'Uthman (Allah be pleased with them) met at 'Usfan; and Uthman used to forbid (people) from performing Tamattu' and 'Umra (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 'Umra).
Reference: Sahih Muslim 1223 c In-book : Book 15, Hadith 173 USC-MSA web (English) : Book 7, Hadith 2816 (deprecated)
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