"Ihya Ulum al-Din," or "The Revival of the Religious Sciences," is a seminal work by the Islamic scholar Al-Ghazali. Written in the 11th century, it aims to revive the spiritual and ethical dimensions of Islam by integrating religious teachings with daily life. The book is divided into four main sections: worship, social conduct, the heart's purification, and the knowledge of the afterlife. This comprehensive text emphasizes the importance of intention and sincerity in religious practices. It addresses various aspects of life, including prayer, fasting, and charity, while also discussing moral and ethical behavior. "Ihya Ulum al-Din" remains influential in Islamic thought and spirituality.