This document provides information about the definition and virtues of da'wah (inviting people to Islam) according to Islamic sources. It defines da'wah linguistically and Islamically as calling people to Allah and making them better worshippers. The document explains that da'wah was the mission of all prophets, including Prophet Muhammad. It highlights verses from the Quran indicating the excellence of da'wah and its reward, even if one is not successful. The document aims to teach about the fiqh, or jurisprudence, of da'wah.