1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from al-‘Ala’ ibn Razin from Muhammad ibn Muslim who has said the following:

“One of the two Imam, (abu Ja’far or abu ‘Abd Allah), ‘Alayhim al-Salam, was asked about the case of a man who went to bed with a woman out of wedlock; if he could marry her daughter. He (the Imam) said, ‘No, however, if a woman is his wife and he goes to bed with her mother or her daughter or sister, his wife does not become unlawful for him because unlawful does not destroy what is lawful. 5 ”