Kila kanuni lazima itokane na chanzo sahihi, na chanzo hicho lazima kikubaliwe baada ya kukisoma na kuwa na imani thabiti juu yake. Inajulikana sana kwamba vyanzo vikuu vya sheria za Kiislamu ni Kitabu na Sunnah, ambavyo hakuna mvutano juu yake. Kuhusu vyanzo vinavyotokana na hivyo – Ijmaa' (makubaliano ya wanazuoni), Qiyas (kulinganisha), Istihsan (upendeleo wa kisheria), Mazhab as-Sahabi (kufuata maoni ya Maswahaba), na Shar'a man Qablena (sheria ya walioishi kabla yetu) – kuna mvutano juu ya vyote hivi. Kuchunguza mtazamo wa kundi kuhusu kile kinachochukuliwa kuwa ushahidi kunatoa mwanga juu ya mbinu yake katika kuchukua sheria kutoka kwenye Shar'a.

Since every rule must come from a correct source, the source must be adopted after study and becoming definitely convinced of it. It is well known that the principal sources of Islamic legislation are the Book and the Sunnah, over which there is no disagreement. As for the resultant sources – Ijmaa’ (consensus), Qiyas (analogy), Istihsan (juristic preference), Mazhab as-Sahabi (following the opinion of the Sahabah), and Shar’a man Qablena (the Shar’a of those before us) - there is disagreement over all of these. Examining the group’s view of what constitutes an evidence gives an insight into its approach in adopting from the Shar’a.