The subject of this article is one of the allegorical verses in Quran (mutashabihat) that cannot be solved except by relying on the decisive verses (Muḥkamat). The decisive verses which lie in three categories: general, special and context, are the keys with which one can find the key of understanding the allegorical verses to some extent. Based on the general decisiveness of his prophecy and his special characteristics, Prophet Yusuf (a.s) had lofty purposes, as educating and guiding the people. In this regard, the plan was to keep his own brother close and attribute the theft to other [step] brothers with the aim of making them aware of their sin, so that they would come to their senses and repent. This goal was not made possible unless by calling them thieves in public and embarrassing them in front of the caravan. At the same time, by doing so, he made possible his other wish, i.e., immigration of his family to Egypt. In this way, the doubt of lie and slander by the Prophet of God will be solved, as the interpretive narrations also confirm this view. However, other interpretive possibilities have been mentioned for these verses, such as: "the guilt of slander is justified for the sake of a sublime purpose", "the announcement was a non-informative sentence" or "the announcement was done by a person in charge"; But given the decisive verses and other reasons, we consider them unlikely.