It is narrated from Marwan bin Hakam that once we were walking with Sayyiduna Uthman (may Allah be pleased with him) when a person was seen reciting the Talbiyah for both Hajj and Umrah. Sayyiduna Uthman (may Allah be pleased with him) asked: Who is this? The people informed him that it was Sayyiduna Ali (may Allah be pleased with him). Sayyiduna Uthman (may Allah be pleased with him) said to him: Are you not aware that I have issued an order prohibiting this? He replied: Of course, but I cannot leave the statement of the Prophet (peace and blessings be upon him) for the sake of your statement.
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 733