Musnad Ahmad 27:1818

Ibn Numayr narrated to us, Ubayd Allah narrated to us, from Nafi’, from Ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Listening and obedience are upon the Muslim individual in what he loves or dislikes, unless he is commanded to commit a sin. If he is commanded to commit a sin, then there is no listening and no obedience."