This book provides clear explanation regarding Islam. It is a religion of da'wah which always invites people to do good and bad deeds in everyday life. This can be seen from Dayah in Aceh as an institution for fostering Islamic da'wah cadres who have traditionally played a role in society, even those related to the development of aqidah, worship and those related to muamalat. So it is very necessary to look clearly at the prospects and functions of dayah educational institutions, especially the MUDI Dayah of Mesjid Raya Samalanga, Bireuen Regency in fostering Islamic da'wah cadres. Success in educating cadres da'wah islamiyah is something that is an obligation for the dayah institution as an Islamic educational institution in Aceh. However, based on current phenomena, not all dayahs in Aceh can carry out their duties as an educational institution, namely educating and fostering Islamic da'wah cadres. For this reason, this book created to examine the activities carried out by the MUDI Dayah Samalanga in educating and fostering Islamic da'wah cadres.This book provides clear explanation regarding Islam.