"The divorce of a slave woman is twice, and her waiting period is two menstrual cycles. "
Sunan Ibn Majah Book 10, Hadith 64
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Sunan Ibn Majah Book 10, Hadith 63 Next Hadith → "The divorce of a slave woman is twice, and her (waiting) period is two menstrual cycles." Abu 'Asim said: "I mentioned this to Muzahir and said: 'Tell me what you told Ibn Juraij.' So he told me, narrating from Qasim from 'Aishah, that the Prophet (ﷺ) said: 'The divorce of a slave woman is twice, and her (waiting) period is two menstrual cycles."'

Sunan Ibn Majah Book 10, Hadith 65