Analyzing the function of the linguistic device (substitution) in the blessed Surah "Al-Nahl" from the perspective of the text coherence theory of Ruqiyeh Hassan and Michael Halliday.

The Holy Quran is the most eloquent text available to mankind. To examine and analyze this unique text, researchers have used various methods and models so far. One of the new methods of text analysis has been proposed in the form of Halliday and Hassan's textual cohesion theory. Examining the Qur'an text from the perspective of the role-oriented systematic theory of Halliday and Hassan, based on the semantic relations that lead to the creation of cohesion , can show how with the linguistic device of substitution, an element has been able to replace a lot of meaning with a little vocabulary and avoid unnecessary repetition. It avoids a verbal form, sentences or sentences and produces a coherent and integrated text while repeating the concept and continuity of the meaning and line of thought. Sometimes several verses are tied together and connected to such an extent that it is not possible to remove or move one of them without causing a disturbance in the meaning and creating ambiguity and confusion for the audience . Substitution device in Surah Al-Nahl by creating knots and links of the Co-Classification and creating a coherent chain, respectively: Clausal substitution, nominal substitution and Verbal substitution, have the highest to the lowest frequency. Continuity and continuation of the meaning and creating a connection between the verses without repeating many pronouns in accordance with the principle of linguistic economy is a matter that happened with the careful use of the Substitution device in this surah.