It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that he said: Seven (relations) are forbidden because of lineage, and seven are also forbidden because of relationship by marriage (musaharah). Then he recited these verses: "Forbidden to you are your mothers, your daughters, your sisters, your paternal aunts, your maternal aunts, your brother's daughters and your sister's daughters"; these are forbidden because of lineage. (And he further recited:) "And your mothers who nursed you, your sisters through nursing, the mothers of your wives, and your stepdaughters under your guardianship born of your wives with whom you have consummated marriage; but if you have not consummated marriage with them, there is no sin upon you; and the wives of your sons who are from your own loins, and that you take two sisters together, except for what has already passed" [Surah Al-Nisa': 23] , and (he said:) "And do not marry those women whom your fathers married" [Surah Al-Nisa': 22] . This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), and they did not record it. It has an authentic supporting narration (shahid) from the narration of Ikrimah.