This book is the first in the series. It deals with a subject that afflicts the human being, in various forms, from birth until death. It strikes as light as a simple cold or allergy, and as hard as a plague or cancer. It keeps the human being under check, reminding him of his weakness, and giving him a chance to turn to the One Who possesses to afflict and cure. It deals with sickness, its regulations, and lessons associated with it. Furthermore, it contains an extensive coverage of regulations relating to the disabled. Despite its great importance to the Muslim, it is hard to find the subject matter of this book compiled all in one book, not only in English, but in Arabic as well.