They were cold-bloodedly murdered or captured by their very hosts With all these hardships the Muslims of Arabia had to cope, and under all these circumstances they had to work. They had a message to deliver to mankind, a contribution to make to humanity, and a formula of salvation to offer. The Qur’an says invite to the Way of God by wisdom and beautiful preaching, and argue in the most gracious manner. But who was there prepared to listen to the peaceful Call of God? It is a fact that many disbelievers used to avoid hearing the Prophet lest they might be affected by his peaceful preaching. They even resisted by force the peaceful Call of Islam. The early experience of Arabia taught the Muslims that it is more effective to be peaceful and at the same time stand on guard; that you can move in peace only when you are strong enough to guard your peace; that your voice of peace would echo better when you are able to resist pressure and eliminate oppression Now they had, by the order of God, to make Islam known to the outside world, but there was no telecommunication system or press or any other mass medium of communication. There was only one course to take, namely, personal and direct contacts, which meant that they had to cross the borders. But they could not do that in small or unarmed groups. So they had to move in large protected groups which must have appeared like an army, but was not an army in the real sense. They crossed the borders in various directions at different times. What took place then deserves consideration. In some areas they were warmly welcomed by the natives, who had long been oppressed and subjugated by the foreign powers of Rome and Persia. In some other areas they were first to offer Islam to those who were prepared to accept it, and there were many. Those who did not embrace Islam were asked to pay tributes equivalent to the Islamic tax (Zakah). The reasons for demanding the kind of tax were (i) that they wanted to be sure this taxpayer knew what he was doing, and that Islam was presented to him but he rejected it with his own free will and choice; (ii) that they undertook to protect the taxpayer and guarantee his security and freedom in a way equal to that of the Muslim himself, because any danger to him was a danger to his Muslim compatriot – and, to defend the Muslim, they had to defend the non-Muslim and insure his security; (iii) that the new state of affairs demanded the support and cooperation of all sectors, Muslims and non-Muslims alike: the former by Zakah, the latter by tributes, which were all spent in the public interest; and (iv) that they wanted to be certain he was not hostile to them and their new brethren, or inclined to make troubles for his Muslim compatriots Those who rejected Islam and refused to pay tributes in collaboration with other sectors to support their state made it hard for themselves. They resorted to a hostile course from the beginning, and meant to create trouble, not so much for the new Muslim comers as for the new Muslim converts and their compatriots, the tributepayers.