A work like Saadi's Golestan, which is undoubtedly one of the pillars of Iranian-Islamic culture and Persian language and literature, should be fully and accurately investigated and analyzed; But with a deeper study, many unexplored angles can be identified in this precious work. Perhaps, the reason for that is the easy and restrained nature of Saadi's language, which has made the commentators think that what Saadi said is common sense and does not need to be scrutinized. But since the author of this article has the mission of teaching language and literature and has to discover the fine points of the text and express it in a simple and transferable language, he has tried to answer a challenging grammatical point of the Golestan text by study various descriptions written on Golestan and also using the library research method. And of course, he tried his best to make his answer convincing and logical.