Understanding sorrof is very important, because sorrof is one of the most important sciences in the Arabic language. shorrof discusses how to build sentences from one origin to another form that varies according to the speaker's intentions. Shorrof cannot be separated from the Arabic language, shorrof plays a role in selecting sentences or words in Arabic sentence structure, especially those related to word formation. Likewise, in creating the structure of Arabic sentences so that there are no mistakes and the wording is correct, beautiful and easy to understand, as is the case in the verses of Imam Abu Siri's qosidah burdah. This qasidah still exists today, the qasidah burdah is a literary work that has a special place in Indonesia so that the qasidah is famous and is still read today, this cannot be separated from the beauty of the sentences and the choice of words. So it becomes interesting to research the use of words, especially from the perspective of shorrof science on words that contain i'lal with disposal, making it easier for readers to know the origin of these words and how the i'lal process occurs. The research method used by researchers regarding the analysis of i'lal with the removal of several verses of the burdah kosidah is a qualitative approach with a literature review that examines and analyzes the verses of the burdah qasidah from Imam Abu Siri, data collection techniques with documentation on the words that have been experienced. i'lal bil hazfi. As for the results of the research, there are seventeen sentences that experience the process of disposal or i'lal bilhazfi, including stanzas 3, 5, 6, 18, 19,25, 135, 138,139. The cause of i'lal bil hazfi is due to the meeting of two breadfruit and because of the difficulty of pronouncing the teeut sentence if it is not di'ilal with the removal of the letters, whether the letter is the ashli letter or the zaid letter