Full Sharh — Mishkat al-Masabih 3505
عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَطَاعَنِي فَقَدْ أَطَاعَ اللَّهَ وَمَنْ عَصَانِي فَقَدْ عَصَى اللَّهَ وَمَنْ يُطِعِ الْأَمِيرَ فَقَدْ أَطَاعَنِي وَمَنْ يَعْصِ الْأَمِيرَ فَقَدْ عَصَانِي وَإِنَّمَا الْإِمَامُ جُنَّةٌ يُقَاتَلُ مِنْ وَرَائِهِ وَيُتَّقَى بِهِ فَإِنْ أَمَرَ بِتَقْوَى اللَّهِ وَعَدَلَ فَإِنَّ لَهُ بِذَلِكَ أَجْرًا وَإِنْ قالَ بغَيرِه فَإِن عَلَيْهِ مِنْهُ»
English Translation
Abu Huraira reported God's Messenger as saying, “He who obeys me has obeyed God and he who disobeys me has disobeyed God; he who obeys the commander has obeyed me and he who disobeys the commander has disobeyed me. The imam is only a shield behind whom fighting is engaged in and by whom protection is sought; so if he commands piety and acts justly he will have a reward for that, but if he holds another view he will on that account be held guilty.” (Bukhari and Muslim.)
Source
Mishkat al-Masabih(مشكاة المصابيح)
The Offices of Commander and Qadi
Hadith Number
3505