1-Text.2-Sources.2.1-Sunni Sources.2.2-Shi'a Sources.2.3-Monographs.3-Place and Time.4-Sunna or 'Itra?.5-Importance.5.1-Necessity of the Obedience of Ahl al-Bayt (a).5.2-Infallibility of Ahl al-Bayt (a).5.3-Necessity of the Continuation of Imamate.5.4-Scientific Authority of Ahl al-Bayt (a).5.5-Hadith al-Thaqalayn and Proximity of Islamic Sects.6-See Also.7-Notes.8-References.