During the tenth year of the hijrah, as in the preceding one, numerous embassies continued to pour into Medina from all parts of Arabia, to testify to the allegiance of their chiefs and their tribes. Teachers were sent by the Prophet into the different provinces to teach the new converts the principles and precepts of Islam. These teachers were invariably given the following injunctions when they were about to depart on their mission: "Deal gently with the people, and be not harsh; cheer them, and do not look down upon them with contempt. You will meet with many believers in the Holy Scriptures, who will ask you: 'What is the key to heaven?' Answer them that it (the key to heaven) is to bear witness to the divine truth and to do good."
