According to the principles of Islamic jurisprudence “Argument” is the source with which we reach the Islamic command after valid thinking and consideration. The source of Islamic jurisprudence is known as “Adilatil ahkam (ادلۃ الاحکام). According to Mulana Taqi Ameeni these sources are twelve in number. There are three kinds of these sources. One kind of these sources is that on which all Muslims and their Mujtahedeens are agreed. These sources are Quran and Sunnah. The second kind of these sources is that on which majority of Muslim Imams are agreed. These are Ijma and Qias. The third kind of these sources is that on which religious scholars are different. According to some Islamic scholars Istehsan, masalah mursala, urf,Taamul e Madina are independent sources of Islamic jurisprudence. But some religious scholars did not consider them as a source of Islamic Jurisprudence. So, this research work shows that what is the importance of these sources in the views of four imams of Islamic fiqh.
Keywords: Islamic Jurisprudence, Usool-e-Fiqh, Principles of Islamic Law, Islamic Law