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Ibn Adi mentions and Baihaqi in his book Shoaib Al-Imaan relates from the Messenger of Allah (s.a.w.a.)- One who is not cognizant of my progeny and the Ansar belongs to one of the three groups: Either he is a hypocrite, or an illegitimate born or he was conceived when his mother was menstruating.
Al-Sawaaeq al-Muhreqah pg 231