Musannaf Ibn Abi Shaybah 17025 — A man who owns a slave woman

Abdullah bin Niyar al-Aslami said: I had a slave-girl with whom I used to have intercourse, and with her was a daughter of hers. When her daughter grew up, I thought of leaving this slave-girl and having intercourse with her daughter. I said to myself that I would never do so without asking Sayyiduna Uthman bin Affan (may Allah be pleased with him). So I asked him, and he said: As for me, I would never have relations with both of them.