Sometimes, a poet has to ignore language rules, the poem, and its structure to maintain the meter and beauty of the poem. This ineluctability or the poet's authority is called "the necessity of the poem". Razi Astarabadi is one of the most famous scientists that has endeavored in researching about necessity of poem. This article tries to determine Razi's opinion in the book "Sharheh Alkafieh" according to a descriptive-analysis method. In his opinion, ignoring language rules and the poem is allowable. This, is not only related to the poem, but also to Vessals, anecdotes, and Arab words. It means that poets, writers, and speakers, by the use of changing, increasing, or decreasing words and not observing the rules of the language and the poem, maintain the beauty of meter in some cases. Razi illustrates the necessity of the poem from the poets and interprets them accurately. Sometimes, a poet has to ignore language rules, the poem, and its structure to maintain the meter and beauty of the poem. This ineluctability or the poet's authority is called "the necessity of the poem". Razi Astarabadi is one of the most famous scientists that has endeavored in researching about necessity of poem. This article tries to determine Razi's opinion in the book "Sharheh Alkafieh" according to a descriptive-analysis method. In his opinion, ignoring language rules and the poem is allowable. This, is not only related to the poem, but also to Vessals, anecdotes, and Arab words. It means that poets, writers, and speakers, by the use of changing, increasing, or decreasing words and not observing the rules of the language and the poem, maintain the beauty of meter in some cases. Razi illustrates the necessity of the poem from the poets and interprets them accurately
