Musnad Ahmad 855:4

Yazid—meaning Ibn Harun—narrated to us, Hisham informed us, from Muhammad, who said: A man came to Imran ibn Husayn while we were with him and said: "Al-Hakam ibn Amr al-Ghifari has been appointed over Khurasan." Imran wished for him [well], until a man from the people said to him: "Shall we not call him for you?" He said to him: "No." Then Imran stood up and met him among the people. Imran said: "You have been entrusted with a great matter of the affairs of the Muslims." Then he commanded him, forbade him, and exhorted him. Then he said: "Do you remember the day the Messenger of Allah (peace and blessings of Allah be upon him) said: 'There is no obedience to a created being in disobedience to Allah'?" Al-Hakam said: "Yes." Imran said: "Allah is the Greatest."