Hazrat Abu Nazrah narrates that Hazrat Umar sent Hazrat Harm bin Hayan as the leader of an army. Then Harm became angry with one of the enemies and ordered him to be killed. After that, he turned to his companions and said, "May Allah deprive you of goodness! When I did this, why did you not advise me, and why did you not restrain me from my anger? By Allah, I will not be the leader of any of your affairs." Then he wrote a letter to Hazrat Umar, saying, "O Commander of the Faithful! I do not have the strength to handle the affairs of the people. Please send someone else for this task."