In the history of Islam after the martyrdom of Hz.Uthman, serious problems emerged among the Muslims, and two great wars took place between the Companions. While these events are called strife, this time is called the time of strife. The enemies of Islam who wanted to take advantage of this confused situation of the Islamic ummah, they engaged in various activities that they thought could harm Muslims in order to grow the seeds of strife among Muslims more. Zindīḳs are the (...) leading enemies of Islam. It was necessary for Muslims to recognize the zindīḳs, who were said to have made thousands of narrations on almost every subject. Therefore, Islamic scholars wrote many works about them. In fact the authors of tabaḳāt and ridjāl many of whom were hadith scholars, also mentioned zindīḳs in their works, such that these works were extremely useful in terms of knowing zindīḳs. In this article it was determined for whom the term zindīḳ was used in the works of tabaḳāt and ridjāl and also the situation of hadith transmitters who lived in the first three centuries of the hijri who are alleged to be zindīḳ are discussed. (shrink)