Ja'far al-Sadiq in the context of "Islamic jurisprudence"

The Jaʿfarī school, also known as the Jafarite school, Jaʿfarī fiqh (Arabic: الفقه الجعفري) or Ja'fari jurisprudence, is a prominent school of jurisprudence (fiqh) within 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, shaping various aspects of governance, legislation, and judiciary in the country. In Lebanon, this school of jurispudence is also accounted for in the legal system of the country and Shia Muslims can call upon it for their legal disputes.

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. Since 1959, Jaʿfari jurisprudence has been afforded the status of "fifth school" along with the four Sunni schools by Azhar University. In addition, it is one of the eight recognized madhhabs listed in the Amman Message of 2004 by King Abdullah II of Jordan, and since endorsed by Sadiq al-Mahdi, former Prime Minister of Sudan.

Ismailism, known historically and among practitioners as Esotericism, is a branch of Shia Islam. Like all Shia, the Ismailis emphasize a distinction between the exoteric (zahir) and esoteric (batin) dimension of Islam, and hold that the esoteric meaning was preserved from corruption by a line of descendants of Muhammad (imams). However, unlike other Shia, the Ismaili are characterized by a unique emphasis on the esoteric that approaches antinomianism.

The Isma'ili (/ˌɪzmɑːˈɪliː/) get their name from their acceptance of Imam Isma'il ibn Jafar as the appointed spiritual successor (imām) to Ja'far al-Sadiq, wherein they differ from the Twelver Shia, who accept Musa al-Kazim, the younger brother of Isma'il, as the true Imām.

Malik ibn Anas (Arabic: مَالِك بْن أَنَس, romanized: Mālik ibn ʾAnas; c. 711–795), also known as Imam Malik, was a Muslim scholar, jurist, muhaddith and traditionalist who is the eponym of the Maliki school, one of the four schools of Islamic jurisprudence in Sunni Islam.

Born in Medina into the clan of Humayr which belonged to the Banu Taym of Quraysh, Malik studied under Hisham ibn Urwa, Ibn Shihab al-Zuhri, Ja'far al-Sadiq, Nafi ibn Sarjis and others. He rose to become the premier scholar of hadith in his day, Referred to as the Imam of Medina by his contemporaries, his views in matters of jurisprudence became highly cherished both in his own life and afterward, becoming the eponym of the Maliki school, one of the four major schools of Islamic jurisprudence. His school became the normative rite for Sunni practice in much of North Africa, al-Andalus (until the expulsion of medieval native Iberian Muslims), a vast portion of Egypt, some parts of Syria, Yemen, Sudan, Iraq, and Khorasan, and the prominent orders in Sufism, the Shadili and Tijani.

The doctrine of the Imamate in Isma'ilism differs from that of the Twelvers because the Isma'ilis had living Imams for centuries after the last Twelver Imam went into concealment. They followed Isma'il ibn Ja'far, elder brother of Musa al-Kadhim, as the rightful Imam after his father, Ja'far al-Sadiq. The Ismailis believe that whether Imam Ismail did or did not die before Imam Ja'far, he had passed on the mantle of the imamate to his son Muhammad ibn Isma'il as the next imam.

Naqshbandi (Persian: نقشبندیه) is a major Sufi order within Sunni Islam, named after its 14th-century founder, Baha' al-Din Naqshband. Practitioners, known as Naqshbandis, trace their spiritual lineage (silsila) directly to the Prophet Muhammad through the first caliph, Abu Bakr, via Ja'far al-Sadiq. The Naqshbani order is distinct for its strict adherence to Sharia (Islamic law) and silent dhikr practices adopted from earlier Central Asian masters.