Roman Jakobson, one of the founders of the functional linguistics school in Prague believes  that all linguistic constructions have goals. These goals should be explained with reference to communication goals. Therefore, for linguistic constructions centered on six elements of the speaker, listener, message, message context, communication channel, and message components, he introduces six emotional, persuasive, literary, referential, empathic, and cryptic functions. Due to having the components of Jakobson's theory, the sermons of Nahj al-Balaghah can be adapted to this theory. The sermon of Jihad, as its title suggests, is about the virtue of Jihad and the negative consequences of turning away from struggle. It was assumed that its linguistic constructions had a persuasive function for the purpose of exciting the audience. The present research is organized with the analytical-descriptive method based on Jakobson's communication model with the aim of understanding the function of the linguistic constructions in the Jihad sermon. The result of the research showed that, contrary to expectations, most of the linguistic constructions defined in Jakobson's theory, including persuasive, referential, cryptic, emotional, and empathy, have been used in this sermon in such a way that they all have an emotional function. Therefore, despite the diversity of construction, functional unity has been preserved.