The Kitáb-i-Íqán (, "The Book of Certitude") is one of many books held sacred by followers of the Bahá'í Faith; it is their primary theological work. One Bahá'í scholar states that it can be regarded as the "most influential Quran commentary in Persian outside the Muslim world," because of its international audience. It is sometimes referred to as the Book of Iqan or simply The Iqan.