Twelver Shia in the context of "Mary in Islam"

Principles of Islamic jurisprudence (Arabic: أصول الفقه, romanized: ʾUṣūl al-Fiqh) are traditional methodological principles used in Islamic jurisprudence (fiqh) for deriving the rulings of Islamic law (sharia).

Traditional theory of Islamic jurisprudence elaborates how the scriptures (Quran and hadith) should be interpreted from the standpoint of linguistics and rhetoric. It also comprises methods for establishing authenticity of hadith and for determining when the legal force of a scriptural passage is abrogated by a passage revealed at a later date. In addition to the Quran and hadith, the classical theory of Sunni jurisprudence recognizes secondary sources of law: juristic consensus (ijmaʿ) and analogical reasoning (qiyas). It therefore studies the application and limits of analogy, as well as the value and limits of consensus, along with other methodological principles, some of which are accepted by only certain legal schools (madhahib). This interpretive apparatus is brought together under the rubric of ijtihad, which refers to a jurist's exertion in an attempt to arrive at a ruling on a particular question. The theory of Twelver Shia jurisprudence parallels that of Sunni schools with some differences, such as recognition of reason (ʿaql) as a source of law in place of qiyās and extension of the notions of hadith and sunnah to include traditions of the imams.

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.

The hadith of the twelve successors (Arabic: حَدِيْث ٱلْإِثْنَي عَشَر خَلِيْفَة, romanized: ḥadīth al-ithnā ʿashar khalīfa) is a widely-reported prophecy, attributed to the Islamic prophet Muhammad, predicting that there would be twelve successors after him. As there were many more rulers after Muhammad, Sunni authors have variously identified these twelve successors with some of these rulers. In Twelver Shia, these successors are instead identified with their Twelve Imams. Their last imam, Muhammad al-Mahdi, is believed to miraculously remain in occultation since 874 CE, and is expected to return in the end of times to eradicate injustice and evil.

Muhammad al-Mahdi (Arabic: محمد بن الحسن المهدي, romanized: Muḥammad ibn al-Ḥasan al-Mahdī) is believed by the Twelver Shia to be the last of the Twelve Imams and the eschatological Mahdi, who will emerge in the end of time to establish peace and justice and redeem Islam.

Hasan al-Askari, the eleventh Imam, died in AH 260 (873–874), possibly poisoned by the Abbasids. Immediately after his death, his main representative, Uthman ibn Sa'id al-Asadi, claimed that the eleventh Imam had an infant son named Muhammad, who was kept hidden from the public out of fear of Abbasid persecution. Uthman also claimed to represent Muhammad, who had entered a state of occultation. Other local representatives of al-Askari largely supported these assertions, while the Shia community fragmented into several sects over al-Askari's succession. All these sects, however, are said to have disappeared after a few decades except for the Twelvers, who accept the son of al-Askari as the twelfth and final Imam in Shia Islam, remaining in a state of occultation.

Muslims, including Shia, Sunni, Ibadi and other branches, agree on two holiest sites in Islam being the Masjid al-Haram (including the Kaaba) in Mecca; the Masjid an-Nabawi in Medina.

Sites associated with the Islamic prophet Muhammad, his daughter Fatima and son-in-law Ali, the respective Shia Imams descended from them and their family members (collectively referred to as Ahl al-Bayt) are considered holy by the different Shia Muslim sects. Karbala and Najaf in Iraq are two of holiest cities revered by all Shia sects. Additionally, Mashhad and Qom in Iran are two of the holiest cities to Twelver Shia, the largest Shia sect.

The Four Books (Arabic: ٱلْكُتُب ٱلْأَرْبَعَة, romanized: al-Kutub al-ʾArbaʿa) are the four canonical hadith collections of Shia Islam. The term is used mostly by Twelver Shias.

Shia Muslims use different hadith books than those used by Sunni Muslims, who prize the six major hadith collections. Unlike Sunnis, Twelver Shi'i Muslims uphold the Twelve Imams as their absolute authority of religion after the prophet Muhammad, and thus much of their hadith is transmitted on the authority of the Imams. Shi'ites considers many hadith transmitters in Sunni tradition to be unreliable, particularly due to their indifferent or, at times, antagonistic stance towards Ahl al-Bayt (Household of Muhammad).