“Abu ‘Abd Allah (a.s.), has said that ’Amir al-Mu’minin has said, ‘In the following eight cases marriage is not permissible: Your slave-girl whose mother is your slave-girl, or her sister is your slave-girl, your slave-girl who is your paternal aunt of breastfeeding, your slave-girl who is your maternal aunt of breastfeeding, your slave-girl who has breastfed you, your slave-girl who has gone to bed with someone until passing of one menses cycle, your slave-girl who is pregnant from another man, your slave-girl whose value is being assessed and is not yet purchased and your slave-girl who has a husband.’”