29 Journal of Interdisciplinary Qur’anic Studies Vol.1, Issue 2, December 2022, 29-56 The Study on Qur’anic surahs' Structured-ness and their Order Organization Using NLP Techniques EHSAN KHADANGI 1 Assistant Professor, Computer Engineering Department, Shahed University, Tehran, Iran MOHAMMAD MOEIN FAZELI Imam Hussein Comprehensive University, Tehran, Iran MEHDI NAGHAVI Faculty of Computer Engineering, Imam Hussein Comprehensive University, Tehran, Iran Article History: Received 25 August 2022; Accepted 22 November 2022 ABSTRACT: The study of surahs' structure has attracted researchers' attention in recent years. One of the theories herein is the theory of Topic Sameness which acknowledges that each surah of Qur’an has formed on a single topic. The theory of Introduction and Explanation as one of the most important branches of Topic Sameness, proposes that the Almighty states the topic of each surah at the first section, elaborates it at different parts of the surah in the forms such as stories, signals of nature, and future predictions, and concludes from the stated contents at the final part. In this paper, we accordingly intend to study the two theories using NLP techniques for the first time. In this regard, based on the three methods of tf-idf, word2vec and roots' accompaniment in verses, the similarity of Qur’anic roots is computed. Then, the amount of similarity of the concepts within surahs to each other is calculated and compared with the random mode. The results show that the studied surahs hold the inner coherence between the concepts so that they have been formed on a single topic or a few topics related to each other. In addition, the study on the similarity between the first and the body sections of each surah shows that the structure of Introduction and Explanation seems to be true for many surahs by the designed methodology. 1 . Corresponding Author. E-mail Adress: khadangi@shahed.ac.ir Original Paper