Al-Bab al-Hadi Ashar (or the "Eleventh Chapter") is a treatise on the principles of Shi'ah Theology by 'Allamah al-Hilli (648-726 AH). It is a classic Shi'ah theological text that covers the five primary principles of Aqaid - Tawhid, 'Adalah, Nubuwwah, Imamah and al-Ma'ad. This work is usually published and taught alongwith its commentary by Miqdad al-Fadhil al-Hilli (8th Century AH). These 30 Arabic lectures on the book are given by Sayyid Kamal al-Haydari (Qum, Iran).