"The Imam is like a shield whose orders should be obeyed when they (the Muslims) fight, and where they should seek protection. If he enjoins fear of Allah and behaves justly, then he will be rewarded, but if he enjoins otherwise, then it will be a burden (of sin) on him." (Using translation from Nasāʾī 4196)  

عَنْ رَسُولِ اللهِ ﷺ قَالَ وَقَالَ «إِنَّمَا الْإِمَامُ جُنَّةٌ يُقَاتَلُ مِنْ وَرَائِهِ وَيُتَّقَى بِهِ فَإِنْ أَمْرَ بِتَقْوَى اللهِ وَعَدَلَ فَإِنَّ لَهُ بِذَلِكَ أَجْرًا وَإِنْ يَأْمُرْ بِغَيْرِهِ فَإِنَّ عَلَيَهِ وِزْرًا»