l-Mustafa, (Healing by the recognition of the Rights of the Chosen One), of Qadi 'Iyad (d. 544H/1149CE) is perhaps the most frequently used and commented upon handbook in which the Prophet's, may Allah bless him and grant him peace, life, his qualities and his miracles are described in every detail. Generally known by its short title, Ash-Shifa, this work was so highly admired throughout the Muslim world that it soon acquired a sanctity of its own for it is said: "If Ash-Shifa is found in a house, this house will not suffer any harm... when a sick person reads it or it is recited to him, Allah will restore his health." Ash-Shifa gathers together all that is necessary to acquaint the reader with the true stature of the Prophet, may Allah bless him and grant him peace, with the esteem and respect which is due to him, and with the verdict regarding anyone who does not fulfil what his stature demands or who attempts to denigrate his supreme status - even by as much as a nail paring.