Ja'fari schoolThe Jaʿfarī school, also Jafarite school, Jaʿfarī fiqh (الفقه الجعفري) or Ja'fari jurisprudence, is the school of jurisprudence (fiqh) in Twelver and Ismaili (including Nizari) Shia Islam, named after the sixth Imam, Ja'far al-Sadiq. In Iran, Jaʽfari jurisprudence is enshrined in the constitution. It differs from the predominant madhhabs of Sunni jurisprudence in its reliance on ijtihad, as well as on matters of inheritance, religious taxes, commerce, personal status, and the allowing of temporary marriage or mutʿa.