Laws, religious texts, literature books and similar works have reached today by being saved as written texts. Skilled volunteer and attendants have retained this saving activity until today. In this way, some of the heritage of humanity has been handed down to us. The people who work for serving this need are called as revelation clerk, recorder, clerk or different words which means the same in different languages. The starting point of this article is the attendants who are on duty to write and edit these texts in some part of the history, in other words; musawwid. We called it as one of the law document preperation experts. Since we did not come across a study that dealt with the institution of musawwid independently, we examined this subject. In this article, various activities related to the writing of official documents since the History of Islamic Law have been touched upon. Then, in the history of Ottoman jurisprudence, the duty of the musawwid, his function in the fatwa house, and his role in the writing of fatwas are analyzed. This study has also tried to demonstrate that the activity of writing fatwa is a separate profession and a field of interest that requires care. Prominent individuals who performed the duty of musawwid and some branches of service similar to musawwid from the past to the present are also included to show that the subject is constantly up to date. Despite similarities, being a mu- sawwid is a different profession from being a clerk. In fact, in some studies that deal with the clerkship, the position of musawwid is dealt with separately. Briefly, this study tries to reveal the origins of official document preparation activities in the history of Islamic Law, some clerks who were engaged in this field in the Ottoman Empire, and some contemporary activities close to this profession.