The science of jurisprudence is one of the legal sciences that scholars have been interested in since the first centuries of Islam, and they wrote many books about it, and the science of manuscripts is considered one of the scientific achievements in which many scholars emerged, including Imam Al-Samaani, so I chose this manuscript related to Istism to clarify its concept and meaning for all people, The student (Ali Ahmed Abdel-Aziz Sheikh Hamad) preceded me in the investigation of part of the book, and it was facilitated for me, by the grace of God Almighty, to investigate the issue (if one of the Muslim spouses apostatized and one of the infidel spouses converted to Islam until the end of the issue of if the two spouses were taken captive together, the marriage is invalid). The book is to avoid prolongation and repetition. The nature of the research required that it be according to the following plan:
The first section: the academic section, which I have dealt with here briefly, as the student preceded me in studying it, and it included: First - the definition of the work. And our last prayer is that praise be to God, Lord of the worlds, and may God’s blessings and peace be upon our master Muhammad and his family and companions.