Abstract
The paper deals with –the doctrinal researches of the invisibles- by Ibn AL-Mulaqen (May Allah bless him). To be known, this scientist has many compilations in variable sciences. He has a brilliant role in this science because it is considered one of religious fundamentals. It is worth mentioning that the researcher concerns the most important compilation by Ibn AL-Mulaqen that is –The book of illustration to explain the strong compiler- because he concerns the research works of the invisibles. One of them is the truth nature of (spirit). He presents prosperous scientific materials to everybody wants to utilize. Also he deals with the opinions of Islamic nation scientists either the researchers or others. The doctrinal cases are regarded beyond the strong sources –Holy Quran and Sunna of the Prophet- in order to get acceptance by the nation if Allah willing.
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