Ruh al-Kafi is a significant collection of hadiths in Shia Islam, compiled by the renowned scholar Sheikh Abu Ja'far Muhammad ibn Ya'qub al-Kulayni. It serves as a comprehensive source of teachings and traditions attributed to the Prophet Muhammad and the Imams, providing guidance on various aspects of life, faith, and ethics. The work is divided into three main sections: Usul al-Kafi, which deals with theological principles; Furu al-Kafi, focusing on practical laws and rituals; and Rawdat al-Kafi, containing miscellaneous traditions. This collection is highly regarded for its depth and authenticity within the Shia community.