Muwatta' of Imām Mālik (d. 179/795), which is an important work that contains mursal narrations and was compiled in the early period of hadīth, has been the subject of various studies by both Muslim and non-Muslim researchers in many aspects. Likewise, Sahīh of Imām Bukhārī (d. 256/870) is considered the pinnacle of the writings in the third century AH and has been studied and examined from many perspectives in the past and present. By discussing the relationship between Muvatta’ and Sahīh of Bukhārī sometimes in separate works and sometimes under certain titles, it has been the subject of study the common aspects of both books, their narrators, similarities and differences between the narrations, and the common features-methods of their authors. The period when isnād has started to be asked and its systematic use following this period and the general characteristic of the hadīth narration in the studies of the first centuries of history of hadīth are convenient topics to provide important information about the isnād transmission and the structure of the books belonging to the relevent period. For this reason, when the beginning and formation of isnād is investigated related to the issue of verbal and written transmission, it is seen that the narrations in Muwatta’ and al-Kutub al-sittah are compared in terms of their isnāds in many studies written in the modern period, especially in the orientalist literature. In this context, various evaluations are made about the history of hadīth transmission by comparing the narrations in the early period works with the essential hadīth books, especially Sahīh of Bukhārī in terms of certain features. This article aims to compare these two works, Muwatta’ and Sahīh of Bukhārī, in terms of irsālittisāl by focusing on the issue of “reporting a hadīth by mursal (lacking the mention of the companion transmitter) chain and transmitting the same hadīth with the mawsūl (uninterrupted) chain”. The main goal in choosing Muwatta', which includes a lot of mursal narrations and Bukhārī’s Sahīh which best represents the period in which isnād was used systematically is to reveal the structure of hadīth narration with isnād. The aim in question is achieved by analyzing an isnād and matn analysis of two narrations selected from Muwatta’ and Sahīh of Bukhārī in order to elucidate the issue of irsāl-ittisāl. In this context, firstly, one narration that was transmitted in Muwatta' with mursal chain which was also included in Bukhārī’s Sahīh with mursal isnād has been analyzed, then a narration that was transmitted in Muwatta' with mursal chain and mentioned in Bukhārī’s Sahīh with mawsūl isnād has been analyzed in detail. These isnād and matn analyzes made in the framework of two selected hadīths were carried out in the context of the issue of irsāl-ittisāl in order to reveal the formation process of isnad. In addition, this study, which draws attention to the connection between Muwatta' of Imām Mālik and Sahīh of Imām Bukhārī, which influenced almost all hadīth books published after them, contributes to understanding the process of hadīth transmission with isnād.