The 'Prophet said, "It is obligatory for one to listen to and obey (the ruler's orders) unless these orders involve one disobedience (to Allah); but if an act of disobedience (to Allah) is imposed, he should not listen to or obey it."  

عَنِ النَّبِيِّ ﷺ وَحَدَّثَنِي مُحَمَّدُ بْنُ صَبَّاحٍ حَدَّثَنَا إِسْمَاعِيلُ بْنُ زَكَرِيَّاءَ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ ؓ عَنِ النَّبِيِّ ﷺ قَالَ السَّمْعُ وَالطَّاعَةُ حَقٌّ مَا لَمْ يُؤْمَرْ بِالْمَعْصِيَةِ فَإِذَا أُمِرَ بِمَعْصِيَةٍ فَلاَ سَمْعَ وَلاَ طَاعَةَ