Language is a word used by humans to convey their meaning. Allah created differences in speech, and that is why various languages arose in this world. The purpose of this study is to find out in more detail about the branch of balaghah science, namely in the Qur'an which is related to the language style of communication and is strengthened by the views of exegetes in their work in the field of exegesis. Balaghah studies the use of language styles of communication that are adapted to situations and conditions. Based on the results of this study, there are many verses in the Al-Qur'an that command people to speak in words that are in accordance with the ethics of communication in Islam, namely: Qaulan Ma’ruufa, Qaulan Kariima, Qaulan Baligha, Qaulan Maisuuro, Qaulan Sadiida, Qaulan Layyina. In terms of degree, then we will sort into karima or a good speech, ma’rufa or good, layyina or meekly, baligha or exactly, maysura or easy, dan sadida or right. Six principles of communication style in the Qur'an, if viewed from the science of balaghah then all words like anything should use a good communication style so that the purpose conveyed does not become something that causes misunderstanding.