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In page Zainab bint Muhammad:

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They have said about the cause of her death: when she was coming from Mecca to Medina, men from Quraysh chased her, and two men named "Habar bin Aswad" and "Nafi bin Abdul Qais" reached her and attacked her. As they said, she was pregnant and aborted her child. As a result of this incident, she fell ill and did not recover until she died in 8 AH.[citation needed]