Ijtihad dalam Bentang Sejarah Prakodifikasi Ushul Fiqh

This paper is aimed to know the real description about ijtihaddone before the codification of usul fiqh. Theoretically, law product should be establised from theories of usul fiqh, but the reality there are many law products appear before usul fiqh is exists. The laws of islam which is established from ijtihad is different from what we know recently, especially in applying the study of ushul fiqh, it is happened because it is established in the 2nd century of hijriyah. it means that more 200 years, moslems society established the law product without any books about ushul fiqh. where as, it is a must that ijtihad is established after the study of ushul fiqh is exist.From this study, it is know that the product of law is establishedfrom Ijtihad which is done before codification of Islamic law inapplying the theories of istinbath written in study of ushul fiqh,although this theory has not been written systematically. Ijtihad whichis done by sahabat, tabi'in and tabi 'tabi'in based on theories ofistinbath which is kept well in their chest. They don't learn about the study of usul fiqh from reading a book but directly from their teacher. Something they got from the teacher will be memorized and then they apply it when they face a new cases.