Yunus narrates from Ibn Shihab (may Allah have mercy on him) that he was asked about combining two slave-women who are sisters, and he said that Niyar al-Aslami (may Allah have mercy on him) asked one of the noble Companions (may Allah be pleased with them): May two sisters who are slave-women be combined under one ownership? He said: "One verse makes them both lawful while another makes them forbidden, but I would not do it." Then Niyar al-Aslami (may Allah have mercy on him) left that man and met another Companion of the Messenger (peace and blessings be upon him), who asked: "What ruling did the one from whom you sought a ruling give you?" He told him, and he said: "I forbid you from combining them both. If you combine them both while I have authority, I will punish you with a punishment that becomes an example for others."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13931