Surah An-Nisa' (The Women), Verse 59

یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْۤا اَطِیْعُوا اللّٰهَ وَاَطِیْعُوا الرَّسُوْلَ وَاُولِی الْاَمْرِ مِنْكُمْ فَاِنْ تَنَازَعْتُمْ فِیْ شَیْءٍ فَرُدُّوْهُ اِلَی اللّٰهِ وَالرَّسُوْلِ اِنْ كُنْتُمْ تُؤْمِنُوْنَ بِاللّٰهِ وَالْیَوْمِ الْاٰخِرِ ذٰلِكَ خَیْرٌ وَّاَحْسَنُ تَاْوِیْلًا 

Yaaa aiyuhal lazeena aamanooo atee'ul laaha wa atee'ur Rasoola wa ulil amri minkum fa in tanaaza'tum fee shai'in faruddoohu ilal laahi war Rasooli in kuntum tu'minoona billaahi wal yawmil Aakhir; zaalika khairunw wa ahsanu ta'weelaa

“O ye who believe! Obey Allah, and obey the Messenger, and those charged with authority among you. If ye differ in anything among yourselves, refer it to Allah and His Messenger, if ye do believe in Allah and the Last Day: That is best, and most suitable for final determination.”

Quran 4:59 (Yusuf Ali Translation)