Beginning of Revelation
In this book, Imām al-Bukhārī discusses the essence of divine revelation, its types and the way it was conveyed to our beloved Messenger (peace be upon him). He presents narrations that demonstrate the way the Prophet (peace be upon him) conducted himself when receiving revelation, both for the first time and later on in his life, and how he would share the divine message with others.

Belief
Imām al-Bukhārī explores the definition of Īmān and Islām, and then looks into their various levels. He opens the doors to a detailed discussion on the different components of Īmān and then enters into the classical theological debate of whether Īmān increases and decreases or not.