one of the most functional reasons in the methodology of islamic principles and jurisprudence as well as law is istiṣḥāb (presumption of continuity). istiṣḥāb is judgment on the continuity of what has existed in the past. most of the legal theoreticians, after waḥīd bihbahānī, believe that istiṣḥāb is a practical principle; however, further research into the evidences for the validity of istiṣḥ...