These are the insurgents who rebel against the imam (rightful ruler), wanting to depose him. The Muslims are required to support their imam in deterring them by the lightest means sufficient for deterrence. If this results in a fight against them or the destruction of their property, there is no liability on the defender, and if the defender dies, he is a martyr.

وَهُمُ: اْلخَارِجُوْنَ عَلىٰ اْلإِمَامِ، يُرِيْدُوْنَ إِزَالَتَهُ عَنْ مَنْصِبِهِ، فَعَلَى اْلمُسْلِمِيْنَ مَعُوْنَةُ إِمَامِهِمْ فِيْ دَفْعِهِمْ بِأَسْهَلِ مَايَنْدَفِعُوْنَ بِهِ، فَإِنْ آلَ إِلىٰ قَتْلِهِمْ، أَوْ تَلَفِ مَالِهِمْ، فَلاَ شَيْءَ عَلىٰ الدَّافِعِ، وَإِنْ قُتِلَ الدَّافِعُ كَانَ شَهِيْدًا.