One of the most colorful and charismatic sects in the history of Islamic thought is the Mu'tazilah sect, which can undoubtedly be called the first rationalists of Islam. Examining the history of the Mu'tazilah, the initiators of rational thought in Islam, will also mean examining the history of Islamic thought in general and the history of kalam in particular. In this study, we will give information about some aspects of Mu'tazila by examining Ahmad b. Yahya b. al-Murtaza's work called Tabaqâtu'l-Mu'tazilah. A descriptive method was used in the study. The work was scanned from beginning to end and remarkable information was reflected in the study. In some places where deemed necessary, some of the ideas expressed in the work have been criticized. Our study consists of introducing the work of Ibnu'l-Murtazâ's Tabaqatu'l-Mu'tazilah with a descriptive method. The relevant work has been scrutinized especially in terms of Mu'tazila's approach to hadith and narrations. The history of the debates around the place of hadith and sunnah in Islam goes way back. When these debates come to the fore, one of the first creeds that come to mind is the Mu'tazilah. However, when the hadith and the Mu'tazilah are mentioned side by side, the first thought that occurs in the minds of the Ahl al-sunnah circles is completely negative. Within the framework of this short book critique, important clues about Mu'tazila's approach to hadith have been determined. At least within the framework of Tabaqâtu'l-Mu'tazilah it is possible to say that we have reached the conclusion that the Mu'tazila will not be defined as a hadith denier sect. One of the most important impressions we get from the work is this: Instead of separating themselves from the main Islamic tendency, the Mu'tazila attaches importance to positioning themselves in the center of the religion of Islam.