Smile has a remarkable function in changing the world. Why is that? Because smile is one of the propagation instruments and the syari Rasulullah SAW who helped complete the glory of pekaus in social ethics and in fostering the harmony of the household. One day, an Arabian Bedouin asked something to the Prophet by pulling his turban to choke, and the pull of the turban left a mark on the neck of the Prophet. This person thinks that the Messenger of Allah must be angry after he did it. However, what happens is the opposite. He gazed at the Messenger of Allah who was not angry over his very rude treatment, but the Prophet SAW smiled sincerely to him. Finally, the sincere smile of the Prophet (s), bringing the Bedouins enjoy the beauty of Islam. A smile based on sincerity and faith can change one's beliefs. The sincerity of the smile and the glory of pekikiran in trade and even the war made him able to spread Islam to Kisra and Persia.
