the term akhbari (from "khabara", news or report) is usually used in contrast to usuli (from "uṣūl al-fiqh", principles of islamic jurisprudence). unlike usulis, akhbaris do not follow or do taqleed of a mujtahid, the "marja‘"s (models for imitation) who practice modern form of ijtihad (independent legal reasoning); consequently they do not accept usul al-fiqh. akhbaris perform taqleed of imam muhammad al-mahdi the twelfth imam of shias who is in the occultation. they say taqleed is permissible when it is performed of an infallible hujja, whereas they consider taqleed to be forbidden when it is performed of a non-infallible. contrary to usulis, akhbaris believe in the perpetuity of sharia from only the infalibles, so the right to interpret the quran is only to 14 infallibles who have complete in-depth gnostic knowledge ("al-rāsixūn fi-l-ʿilm" ). whereas the former believe in the development of jurisprudence with time 'uṣūl al-fiqh', akhbaris seek religious rulings or islamic jurisprudence from a dead or living muhaddith, who has narrated or narrates the rulings hadith of the fourteen infallibles without interpreting it. further akhbaris say that the fourteen infallibles or shia imāms never permitted ijtehad.