One of the fundamental issues in all transmission-based sciences in general—and particularly in the science of hadith—is the deliberate or erroneous interventions made by transmitters (rāwīs) during the transmission of reports. Some of these interventions have led to debates concerning the acceptance or rejection of certain hadiths. However, since the entirety of human historical knowledge relies on transmitted information, a wholesale rejection of transmissions without a consistent methodology would amount to erasing humanity’s collective memory, while uncritical acceptance would contradict human nature and collective experience. Since hadiths are also transmitted reports, they face similar problems. The science of Hadith Methodology (ʿIlm Usūl al-Ḥadīth) was developed to address these issues, and as a result, hadiths have been classified according to their reliability. Certain types of interventions by transmitters were deemed grounds for criticism (jarḥ). Nonetheless, many disputes have arisen, and debates have emerged regarding whether specific terms indicating transmitter interventions should be considered signs of criticism (jarḥ) or endorsement (taʿdīl). These interventions can manifest in various forms, such as word alterations (taḥrīf), orthographic errors (taṣḥīf), interpolations (idrāj), additions (ziyāda), and omissions (ḥadhf), or through the abridgment or expansion of the text via commentary. Other types of interventions include converting disjointed transmissions into connected ones (iṭṣāl), rendering connected reports into disconnected ones (irsāl), elevating the transmission level (rafʿ), or transforming elevated reports into halted ones (mawqūf). Different terms have been used in reference to such interventions in both the isnād and the text of the hadith, and these terms have been defined in the sources of Hadith Methodology. One such concept is tajwīd, which, although referring to transmitter interventions, has not received sufficient attention in well-known Hadith Methodology works. Moreover, discrepancies between its definitions and how scholars have used it highlight the need for dedicated research on the subject. Therefore, this study examines the definition and usage of the term tajwīd by hadith scholars through selected examples. Among the issues considered is the claim that some scholars used the term tajwīd in the sense of tadlīs al-taswiya during the classical era. This claim is evaluated by analyzing various reports. While selecting the reports, numerous examples in which the concept appears were examined, and taking into account the limitations of the article, among those with similar characteristics, one shorter report was preferred in terms of text length. The study identifies the meanings or connotations attributed to the concept by different scholars through diverse examples, thereby enabling the observation of both commonalities and differences in usage. To detect transmitter interventions in reports, a chronological tracking of the narrations was employed. Both the isnād and the text were analyzed in selected examples, and some claims by Orientalist scholars were also evaluated. Notably, some Orientalists have argued that these transmissions were largely shaped by the social, cultural, and political context of Islamic society, and that even their isnāds were retrospectively constructed. The findings of the study also address the validity or invalidity of these claims. This is particularly relevant because the concept of tajwīd as used by early hadith scholars is also related to such interventions. The study utilizes comparative and inductive methods.