The Qur’an is the foundation of all Islamic laws, including laws of marriage and divorce. Where a matter is not addressed specifically there, or where the application of a verse to a certain situation permits several reasonable interpretations, jurists look to the sunnah of the Prophet (including hadith) for additional guidance. Where neither the Qur’an nor sunnah address a matter explicitly, jurists resort to ijtihiid, a system of reasoning and interpretation for which they have articulated several basic principles.