10-27 Muhammad ibn al-Hassan - may God be pleased with him - narrated that Abdullah ibn Ja’far al-Homayry quoted Harun ibn Muslim on the authority of Mus’adat ibn Zyad that Abu Abdullah as-Sadiq (MGB) said, “Ten categories of female slaves are unlawful for their masters. Do not have sex with both a mother and her daughter (who are both your slaves); do not have sex with both of two sisters (who are both your slaves). Do not have sex with your female slave who is impregnated by another man, until she gives birth to her baby. Do not have sex with your female slave if she is the wife of another man. Do not have sex with your female slave who is your foster sister. Do not have sex with your female slave who is your fosterpaternal aunt. Do not have sex with your female slave who is your foster maternal aunt. Do not have sex with your female slave who is menstruating, until she becomes clean. Do not have sex with your female slave who has breastfed you. Do not have sex with your female slave whom you possess in partnership with someone else.”