 He appears, like Dawud al-Zahiri, to restrict consensus historically, defining it as the transmission by many authorities of reports on which the Sahaba agreed unanimously.Like Dawud al-Zahiri, he also held that consensus must be tied to a text and cannot be based on legal analogy.Bosworth, C.E., "Encyclopedia of Islam", "Al-Tabari, Abu Djafar Muhammad b. Djarir b. Yazid"

al-Mawardi, "Ahkam fi Usul al Fiqh"