Djamil, Fathurrahman2019-09-252019-09-252011-05-0919990126-12 Xhttp://hdl.handle.net/20.500.12424/178026There is a hypothesist hat a theological school belongs to a Muslim influences his or her thought in usul al-fiqh (foundation of "lslamic jurisprudence). This paper will focus on Mu'tazila and Asy'ariya. Mu'tazila concept on 'aql or reason is clear that reason can distinguish between good and bad. This concept is a result of their interest in philosophy that may influence their thought. Therefore the Mu'tazilite believe in the ability of reason in understanding everything and it brings them to a statement "reason before law", which means reason should stay before the"syara'" or law. For this reason they agree that before the existence of law, a reasonful person can distinguish between good and bad. One of Mu'tazila principles is adala (God justice), that one of its interpretation is that God does not wish the bad. As a result, M u'tazila believe that. God created all things based on purpose and wisdom. From this point, there seems to be a relation between their teachings and their theories on "usul al-fiqhi'. When there is a conflict between nas and reason, they take reason before nas. Furthermore, they believe that God created the creatures on the basis of purpose, and so what happens to His legislation. This concept has a direct influence to the concept of maslahat that become illa in legislation. Different from Mu'tazila, Ahl al-sunnah w al-Jama'a sees that good and bad can not be understood by reason it self. In addition, they say that God created all creatures not on the basis of purpose, and also God desires good and bad. These principles relate to their theories on usul al-fiqh; e.q. when a conflict between nas and reason emerges, they give priority to nap. They neglect maslaha in their canonical thought. Even though, the hypothesis of the relation between theological unrestrictedly. That happens to Al-Juwayni and al-Razi who were Asy'arites but had different thoughts in usul al-fiqh.indWith permission of the license/copyright holderIslamic ethicsReligious ethicsHUBUNGAN ANTARA KONSEP BAIK DAN BURUK DALAM ILMU KALAM DENGAN KONSEP MASLAHAT DALAM HUKUM ISLAM (Relationship between the concept of Good and Bad in Theology and the concept of benefits in Islamic Law)Article