Strive to do what is right even if others don't agree with you or understand your actions; Respect life after death; Do justice; Remember Allah's judgment day according to deeds in life

This hadith is about a group of people called the Khawarij who were killed in Damascus. Abu Umamah recited a verse from the Quran to emphasize that those who killed them are considered to be among the best dead men under heaven's canopy. He was asked if he heard it from Prophet Muhammad and he said that he heard it multiple times before narrating it. This hadith teaches us that killing someone for justice is not wrong as long as it is done with good intentions and for justice, which should be respected even after death. It also teaches us that we should always strive to do what is right even if others don't agree with us or understand our actions. We should also remember that Allah will judge everyone according to their deeds on Judgment Day, when some faces will become white and some faces will become black depending on their actions in life.