The Twelve Imams in the context of "Ismah"

Twelver Shi'ism (Arabic: اِثْنَا عَشَرِيَّة, romanized: Ithnā ʿAshariyya) is the largest branch of Shia Islam, comprising about 85% of all Shia Muslims. The term Twelver refers to its adherents' belief in the twelve successors, referred to as Twelve Imams, and their belief that the last Imam, Muhammad al-Mahdi, lives in occultation (ghayba) and will reappear as "the awaited Mahdi" (al-Mahdi al-muntazar) alongside Isa al-Masih (Jesus Christ), son of Bibi Mariam (The Virgin Mary), in order to restore justice and peace.

Twelver Shi'as believe that the Twelve Imams are divinely appointed as both spiritual and political successors to the Islamic prophet Muhammad, and that they possess special knowledge and authority to guide the Muslim community. According to Twelver theology, the Twelve Imams are exemplary human individuals who rule over the Muslim community (Ummah) with justice, and are able to preserve and interpret the Islamic law (Sharia) and the esoteric meaning of the Qur'an. The words and deeds (sunnah) of Muhammad and the Imams are a guide and model for the Muslim community to follow. As a result, Muhammad and the Imams must be free from error and sin, a doctrine known as Ismah (literally 'protection') or infallibility, and must be chosen by divine decree, or nass, through Muhammad.

Hasan al-Askari (Arabic: الحَسَن بْن عَلِيّ ٱلْعَسْكَرِيّ, romanized: al-Ḥasan ibn ʿAlī al-ʿAskarī; c. 844–874) was a descendant of the Islamic prophet Muhammad. He is regarded as the eleventh of the Twelve Imams, succeeding his father, Ali al-Hadi. Hasan Al-Askari was born in Medina in 844 and brought with his father to the garrison town of Samarra in 848, where the Abbasid caliphs held them under close surveillance until their deaths, even though neither were politically active. After the death of al-Hadi in 868, the majority of his following acknowledged his son, al-Askari, as their next Imam. Al-Askari's contact with the Shia population was restricted by the caliphs and instead, he communicated with his followers through a network of representatives. He died in Samarra in 873–874 at the age of about twenty-eight and was buried in the family home next to his father, which later developed into al-Askari shrine, a major center for Shia pilgrimage. Shia sources commonly hold the Abbasids responsible for the death of al-Askari and his father. A well-known early Shia commentary of the Quran is attributed to al-Askari.

Al-Askari died without leaving an obvious heir, which created widespread confusion and fragmented the Shia community into several sects, all of which disappeared within a few decades except the Twelver Shia. The Twelvers hold that al-Askari had a son, commonly known as Muhammad al-Mahdi (lit. 'the rightly guided'), who was kept hidden from the public out of the fear of Abbasid persecution. Al-Mahdi succeeded to the imamate after the death of his father and entered a state of occultation. His life is said to be miraculously prolonged until the day he manifests himself again by God's permission to fill the earth with justice. Though in occultation, the Imam still remains responsible in Twelver belief for the spiritual guidance of humankind and the Shia accounts of his occasional encounters with the pious are numerous and popular.
Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

Uyoun Akhbar Al-Ridha (Arabic: عُيُون أَخْبَار ٱلرِّضَا, ʿUyūn ʾAkhbār ar-Riḍā), counted as a Hadith book among Shia, the book was written by Ibn Babawayh, one of the great scholars of Shia Muslims. The book concerned with saying and life of the eighth Shia Imam Ali al-Ridha.

Sahifah of al-Ridha (Arabic: صَّحِيفَة ٱلرِّضَا, Ṣaḥīfah ar-Riḍā, lit. "Pages of al-Ridha"), also known as Sahifat of al-Reza and Sahifat al-Imam al-Ridha ("Book of Imam al-Ridha"), is a collection of 240 hadiths attributed to Ali ibn Musa al-Ridha, the eighth Shia Imam.

The Sahifah is one of the major sources of Shia belief and has attracted the attention of Shia scholars such as Ibn Babawayh and Sheikh Tabarsi. It contains hadiths on various topics including the invocation of Allah; the importance of praying five times a day and of saying the prayer for the dead; the excellence of the household of Muhammad, of the believer, of good manners, of the names Muhammad and Ahmad, of various foods, fruits, and ointments, of obeying parents, of strengthening the bonds of kinship, and of jihad; a warning against cheating, backbiting, or tattling; and other miscellaneous traditions. The section on Muhammad's household discusses each of its fourteen members separately.

Shaykh Haydar or Sheikh Haydar (Persian: شیخ حیدر Shaikh Ḥaidar; 1459–9 July 1488) was the successor of his father (Shaykh Junayd) as leader of the Safavid order from 1460 to 1488. Haydar maintained the policies and political ambitions initiated by his father. Under Sheikh Haydar, the order became crystallized as a political movement with an increasingly extremist heterodox Twelver Shi'i coloring and Haydar was viewed as a divine figure by his followers. Shaykh Haydar was responsible for instructing his followers to adopt the scarlet headgear of 12 gores commemorating The Twelve Imams, which led to them being designated by the Turkish term Qizilbash "Red Head".

Haydar soon came into conflict with the Shirvanshahs, as well as the Ak Koyunlu, who were allied to the former. Following several campaigns into the North Caucasus, mainly in Circassia and Dagestan, he and his men were eventually trapped in 1488 at Tabasaran by the combined forces of the Shirvanshah Farrukh Yassar and Ya'qub Beg of the Ak Koyunlu. In a pitched battled that ensued, Shaykh Haydar and his men were defeated and killed. He was succeeded by his son Soltan-Ali as leader of the order. Soltan-Ali was on his part succeeded by Haydar's younger son, who would become the founder of the Safavid dynasty, and known by his regnal name of Ismail I.