An Almohad text, the anonymous Kitab al-ansab, informs that the genealogy of 'Abd al-Mu'min, both on his father's side and on his mother's, went back to the Arab tribe of Mudar. For Robert Brunschvig, the points of contact between Almohadism and Zahirism were in the predominant position that both gave to the hadith and in their rejection of taswib, that is to say, the principle that "all qualified interpreters of the law speak the truth". The genealogies of 'Abd al-Mu'min seek to establish cognatic links with the family of the Prophet. The worship at the tomb of the pre-Islamic prophet took place in regions bordering the mountainous region where the Kahina resisted the Arab troops. Ibn Hazm makes it very clear in his Fisal that, in accordance with the doctrine of both Malikis Sunnis and Shi'is Musawi, the caliph, to be legitimate, must belong exclusively to the tribe of Quraysh and, more specifically, must be a descendant of Fihr Quraysh.