The known disease and cure with the sufficient answer for whoever asked about the healing medicine

The book of Al-Da and Al-Dawa, also known as Al-Jawab Al-Kafi for those who asked about the healing remedy, is one of the most famous books of Imam Ibn Qayyim Al-Jawziyya. The focus of the book revolves around the idea that sins and disobedience are the "disease" that causes the heart to be sick and corrupts life, and that repentance, seeking forgiveness, and returning to Allah are the "cure" that heals. Ibn Qayyim details in this book the causes of sins and their destructive consequences on the individual and society, and offers spiritual and practical solutions and treatments to get rid of them, emphasizing the power of supplication, the effect of remembrance, and the importance of turning to Allah in all circumstances.