Ihyā' 'Ulūm ad-dīn is the title of a book written by

"Ihyā' 'Ulūm ad-dīn" is the title of a book written by al-Ghazālī. Al-Ghazālī was a famous Islamic theologian and philosopher who lived in the 11th century. "Ihyā' 'Ulūm ad-dīn" is one of his most famous works, and it is considered a masterpiece of Islamic literature. The book is about Islamic ethics, spirituality, and self-development. It is divided into four main parts, which cover topics such as worship, social ethics, love, and knowledge. Al-Ghazālī wrote the book in a simple and accessible language, which made it popular among both scholars and laypeople. The book's teachings have had a significant impact on Islamic thought and continue to be studied and admired today.