A book that contained: the attribute of faith in its completion and degrees, the exception in faith, the increase in faith and the diminution of it, and the name of faith by saying without work, and who made faith knowledge of the heart even if it is not a work, and mentioned what the scholars have done to make faith say without work, and what they forbade About him from their sitting, and exit from faith in sins, then he concluded his book by mentioning the sins that are attached to the sins without a departure from faith.