Combining two sisters, or a woman and her daughter, as concubines

It is narrated from Abu Salih al-Hanafi (may Allah have mercy on him) that Ibn al-Kawwa' asked Sayyiduna Ali (may Allah be pleased with him) about two slave women who are sisters of one another. He (may Allah be pleased with him) said: "One verse has made them lawful and another verse has made them unlawful. I myself do not do it, nor does anyone of my household, and I neither declare it lawful nor declare it unlawful."
According to the narration of Imam Abu Ya'la, Sayyiduna Ali (may Allah be pleased with him) said: "Ask me! For you will not find (in your time) anyone like me to ask, and you will never again be able to ask anyone like me." Thereupon Ibn al-Kawwa' said: "Tell us about two owned sisters and about the foster niece (brother's daughter through nursing)." He (may Allah be pleased with him) said: "Ask about what concerns you, for you are wandering in the valley of aimless bewilderment." He said: "I am only asking you about what we do not know; as for what we know, we do not ask about it." He (may Allah be pleased with him) said: "As for two sisters who are owned, one verse, 'or what your right hands possess' [Surah al-Nisa: 3], has made them lawful in general, and another verse, 'and that you combine two sisters' [Surah al-Nisa: 23], has made (combining two sisters at the same time) unlawful. So I neither command it nor forbid it, and neither I myself do it nor does anyone of my household."

It is narrated from Qabisah bin Dhu'ayb (may Allah have mercy on him) that Sayyiduna Uthman (may Allah be pleased with him) was asked about two slave women who are full sisters of one another. He said: "One verse, 'or what your right hands possess' [Surah al-Nisa: 3], has made them lawful, while another verse, 'and that you combine two sisters' [Surah al-Nisa: 23], has made (combining them at the same time) unlawful, and I do not like to do it myself." When this reached an eminent Companion of the Prophet (peace and blessings be upon him), he said: "If I had any authority over the affairs of the Muslims and such a person (one who had combined two sisters) were brought to me, I would make him an exemplary lesson."
Imam al-Zuhri (may Allah have mercy on him) said: "I think that Companion (who held the strict position) was Sayyiduna Ali (may Allah be pleased with him)."

Sayyiduna Abdullah bin Utbah (may Allah be pleased with him) relates that the Commander of the Believers Sayyiduna Umar al-Faruq (may Allah be pleased with him) was asked about two slave women who are mother and daughter (whether one may have relations with both of them at the same time). He (may Allah be pleased with him) said: "I do not like to declare the two of them lawful together (for intercourse), and I strictly forbid (having relations with) the two of them together."

It is narrated from Ibn Abi Mulaykah (may Allah have mercy on him) that Mu'adh bin Ubaydullah bin Ma'mar asked the Mother of the Believers Sayyidah Aishah (may Allah be pleased with her): "I have a slave woman with whom I have had relations, and she has a daughter who has now reached maturity. May I also have marital relations with her (the daughter)?" Sayyidah Aishah (may Allah be pleased with her) forbade him from that, whereupon Mu'adh said: "I will not desist until you say that it is 'haram' (unlawful)." At this Sayyidah Aishah (may Allah be pleased with her) said (decisively): "No one of my family will ever do such a thing, nor anyone who obeys me."

Ibn Abi Mulaykah (may Allah have mercy on him) relates that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) was asked about this (matter), and he forbade it.