Abstract
praised be to Allah, peace and blessings be upon his prophet and his followers. This is Al-Mussafa book explaining AL-KHILAF set to Abi Al-barakat Hafudh Al-deen Al-Nasafi. I classified the research into two parts. The first is the study and the second is the investigation. The first part is subclassified into two chapters: the first chapter tackled the author's life while the second tackled the book itself giving some definitions, the titles and its relation to the author, the author's approach and my approach throughout the research. The second part shed the light on the investigated text which is the book of fast.
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