The influence of poetry on the morphological and grammatical rules in the Arabic language is great. Because linguists have received help from poetry to reveal language pedestals and have brought evidence with poetry. Sometimes, it has been observed that the uses in poetry occur in contravention of these language pedestals. Some linguists have described these illegal uses as “Shaz”, while others have described them as “the necessity” that the poet was forced to sit the poetry teller. The phenomenon of necessity is one of the most important issues that engage many linguists, old and New, due to the connection of language pedestals to their originals. Due to the unique language of the poetry language, it can go beyond the language rules that occur in normal speech. Therefore, the poet can use the fact of necessity to complete his poem. The poet is not free to choose words and formations in couplets When creating verse couplets, nor is he free to act against the rules of language in his poetry. The poem has to make changes to other couplets to match the movement at the end of the couplet. If the last movement of the word at the end of the poem couplet is calm, it is not obliged to make changes. All of these factors oblige the poet to break the rules of language. Such usage is called the necessity phenomenon. Linguists have disagreed about the phenomenon of necessity. Some attribute this phenomenon to the necessity of the poet, while some other linguists have identified a necessity as illegal uses that occur in poetry from the context. Mohammad Hamâse Abdullatif is one of the contemporary researchers who examined this phenomenon in fine detail. Mohammad Hamâse Abdullatif is recognized as a linguist, literalist, poet and one of the most prominent scholars of Arabic language in the modern era. He has many valuable books in the field of language. As a matter of fact, he has put forward a work called “a review of the language of poetry / the phenomenon of necessity” about the phenomenon of necessity. In this work, he examined the phenomenon of necessity in all its aspects. According to him, no one has ever stood in the way of him in this regard. He has criticized linguists and believes that the uses contrary to the rules of the Arabic language, which grammarians call necessity, are the language of poetry. Grammarians needed such a phenomenon because they tried to apply the specific grammar of the prose language to poetry. If they had considered the language of poetry within its framework, they would not have needed the phenomenon of necessity. In other words, the uses posed as necessary are a phenomenon of the language of poetry. This study will be based on critical and chronological method. In this research, we will shed light on the phenomenon of necessity and try to examine Mohammad Hamâse Abdullatif in the context of his work on the phenomenon of necessity.