This document discusses the importance of da'wah (inviting others to Islam) in Islam. It begins by defining da'wah and providing Quranic verses showing it was the mission of prophets. Da'wah is considered a great virtue, and Allah promises great rewards for those who engage in it, including the same reward as those who follow guidance due to one's da'wah efforts. The document argues da'wah is both an individual and collective obligation for Muslims, and provides evidence that every Muslim should participate according to their ability.