Jaʿfarī school of thought, Jaʿfarī jurisprudence or Jaʿfarī Fiqh is the school of jurisprudence of Shi'a Muslims, derived from the name of Jaʿfar as-Ṣādiq, the 6th Shi'a Imam.
It differs from the four schools or madhhabs of Sunni jurisprudence in its reliance on ijtihad, the use of reason to interpret Islamic laws, as well as on matters of inheritance, religious taxes, commerce, personal status and the allowing of temporary marriage or mutʿa. However, despite these differences, there have been numerous fatwas regarding the acceptance of Jaʿfarī fiqh as an acceptable Muslim madhhab by Sunni religious bodies. These include the Amman Message and a fatwa by Al-Azhar.
According to idea developed by Ayatollah Ruhollah Khomeini, two kinds of Ja'fari jurisprudence can be recognized. One as Conventional Fiqh and another as Dynamic Fiqh. In Dynamic Fiqh, which is backed by the famous text book Javaher-al-Kalem (جواهر الكلم), one should consider the concept of time, era, and age (زمان) as well as the concept of place, location and venue (مکان). He stated that these two concepts have key role in the underestanding and extraction of commandments.