An Iranian story

One of the sons of Harun al-Rashid came to his father angry that a certain colonel called me a mother. Harun said the pillars of the government, what is the punishment for such a person? One pointed to killing, the other to cutting the tongue, and the other to confiscation and negation. Harun said: O son, it is a pity that you forgive, and if you can't, curse your mother, not so much that the revenge goes beyond the limit, then the injustice will be from our side and the lawsuit will be from the enemy.