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The purpose of this article is to elucidate Ali Mustafa Yaqub's theory of Hadith science and how it influenced the formation of Islamic law in Indonesia. It is important to highlight the contribution of Hadith science to the creation of Islamic law to dispel the misconception that Hadith experts and Fiqh experts are incompatible. While Fiqh experts are thought to possess a contextual understanding of Hadith, Hadith experts are called textual experts. It is intriguing to look at Ali Mustafa Yaqub's attempts to solve this issue and his impact on Indonesia's Islamic legal system in this context. This study was carried out through literature research using qualitative research methods and the presentation was carried out descriptively-analytically. The research findings show that Ali Mustafa Yaqub was able to eliminate this dichotomization and prove that there is a close relationship between Hadith and Fiqh (Islamic Law) because the Imams of the Madhab are Fiqh experts as well as Hadith experts, and even have Hadith books. Ali Mustafa Yaqub's studies on Hadith and Law are written in a modern way. This claim is supported by his application of the well-established Istinbath procedure in Islamic jurisprudence. For example, his criticism of MUI Fatwa Number 5 of 2010 concerning determining the direction of the Qibla in Indonesia and the trend of Indonesian Muslims in wearing turbans in daily life shows that Ali Mustafa Yaqub is independent of the existing schools of fiqh, so the conclusions he makes do not tend to support certain groups.
Efendi et al. (Sat,) studied this question.