Hani bin Qabisah came to Madinah and stayed with Ibn Awf (may Allah be pleased with him), and he had four Christian wives. He accepted Islam, and Sayyiduna Umar (may Allah be pleased with him) kept those women in his marriage. Shu'bah said: I asked some of Banu Shayban about it, and they said: There is disagreement about it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 14074