The author of Az-Zari'ah, Haj Sheikh Aagha Bozorg-e Tehrani, has written under the title of his book that Al-Ihtijaj ala Ahlil Lijaaj is authored by great Sheikh Abu Mansur Ahmad bin Ali bin Abi-Talib al-Tabarsi, who was the master of Rashidod Din Mohammad bin Ali bin Shar Aashub as-Saravi who deceased in ۵۸۸ AH; thus, the author is of fifth century's scholars who gained an understanding of the sixth century to the extent that he has observed "All of The Emissaries in this book are of famous diffused traditions of consensus for the pros and cons, and the aforesaid book is of reliable ones which is trusted by all famous scholars like Allamah Majlessi, Mohaddith Horr 'Aamili and others like these two great men.