الأَمْرُ بِالْمَعْرُوفِ وَالنَّهْيُ عَنِ الْمُنْكَرِ
Commanding what is right and forbidding what is wrong.
In the Muʿtazilite interpretation discussed here, commanding good and forbidding evil are obligatory. It also maintains that revolt and armed confrontation against an unjust ruler are necessary.
The general duty to promote good and resist wrong is a recognized religious category, but regarding revolt and armed fighting as categorically required is a separate political claim. It is that particular conclusion which is described here.