Ali ibn Babwayh Qummi
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Ali ibn Babawayh Qummi (?-939) was a Twelver Shi'a scholar from the time of the Ghaybat al-Sughra. He's the father of Shaikh Saduq.
He wrote a letter to Imam Muhammad al-Mahdi, asking for prayer for him to have a child, as doctors had told him he could not have one. Thus was always called his son, Shaikh Saduq: "Oh you that was born by the prayer of Imam Mahdi!".