We have already mentioned that with the Treaty of Ḥudaibiyyah, a new era began in the history of Islām and the life of the Holy Prophet(sa). This new era cannot be thought of as a complete era of peace at all, because many tribes of Arabia were still at war with Islām. However, among the Arabs, since the tribe of the Quraish was generally looked upon with greater reverence due to their guardianship of the Ka‘bah, and since the war against Islām was also instigated by this tribe, an agreement of peace with the Quraish did however, result in a kind of temporary peace in one part of the country. After this partial peace, the first step taken by the Holy Prophet(sa) was a remarkably magnificent achievement in preaching his God-given office of prophethood. We refer to those letters of invitation to Islām, which the Holy Prophet(sa) sent to the kings and chieftains of various sovereignties immediately after the Treaty of Ḥudaibiyyah, and thus furnished practical evidence that the central point of the attention of the Holy Prophet(sa) was the propagation of Islām. That is, to convey this everlasting and final truth to all the people of the world, which the God of this universe revealed through the Holy Prophet(sa). However, prior to the mention of these letters inviting the world to Islām, it seems incumbent that a fundamental note be written with regards to Islām being a religion of preaching, so that readers may be informed as to the perspective of the Holy Prophet(sa) on preaching and the broad sphere upon which the purpose of the commission of the Holy Prophet(sa) was spread.