Abu Ja‘far says: "Our belief concerning the ancestors of the Prophet, may the blessing of Allah be upon him and his pro- geny, is that they were Muslims".ash-Shaykh al-Mufid adds that: The ancestors of the Prophet,may the blessing of Allah be upon him and his progeny, as far as Adam, peace be upon him, were monotheists (muwahhidun) and believers in Allah, as has been demonstrated by Abu Ja‘far, may Allah have mercy upon him, and the consensus of opinion of the adherents of the truth. Allah, the Exalted, says:
Who sees thee when thou standest, and when thou turnest about among those who prostrate themselves [26:218-9],
which means his transmission through the loins of the monotheists. His Prophet, may the blessing of Allah be upon him and his progeny, says: "I was transmitted from the loins of the pure to the wombs of the chaste till Allah, the Exalted, brought me forth in this world of yours," which demonstrates that his ancestors were all believers, since had there been an unbeliever amongst them, then they would not merit the description 'pure', for Allah, the Exalted, says: The polytheists are indeed unclean [9:28]. Hence, He stigmatized the unbelievers are unclean. Consequently, when the Messenger of Allah, may the blessing of Allah be upon him and his progeny affirmed that his ancestors were all chaste and so described them, he confirmed that they were believers.