Musnad Ahmad 658:56

Abu Bakr ibn Ayyash narrated to us, Abu Ishaq narrated to us, from al-Bara’ ibn Azib, who said: The Messenger of Allah (peace and blessings of Allah be upon him) went out with his companions. He said: So we entered into the state of ihram for Hajj. When we arrived in Makkah, he said: "Make your Hajj an Umrah." The people said: O Messenger of Allah, we have already entered into the state of ihram for Hajj, so how can we make it an Umrah? He said: "Look at what I command you to do, and do it." They repeated the statement to him, so he became angry. Then he departed until he entered upon Aisha while he was angry. She saw the anger on his face and said: Whoever angered you, may Allah anger him. He said: "And why should I not be angry when I command a matter, and it is not followed?"