The Revival of the Religious Sciences (Iḥyāʾ ʿulūm al-dīn) is perhaps the most read work in the Muslim history, after the Qurʾān. It is based on the Qurʾān and Sunnah. It deals with every aspect of the outer and inner life of a Muslim. It inspired many of the greatest giants of Islamic civilisation such as Salahuddin Ayyubi. The critical importance that this work played in influencing success in the education sector, economics, political leadership and well-being of Islamic communities, societies and empires across time still continues till today in Islamic communities that hold onto the Ihya closely. More than ever before, Muslim communities that have drifted away from the Ghazzalian tradition and Muslim communities in the West who are still growing in infancy need to revive the learning, teaching and applying of the knowledge of Ihya.
The enormous work is divided into four parts where each contains ten chapters/books. In total it has 40 chapters/books. Part one deals with knowledge and the requirements of faith—ritual purity, prayer, charity, fasting, pilgrimage, recitation of the Qurʾān, and so forth; part two concentrates on people and society—the manners related to eating, marriage, earning a living, and friendship; parts three and four are dedicated to the inner life of the soul and discuss first the vices that people must overcome in themselves and then the virtues that they must strive to achieve.