Yahya related to me from Malik from Abdu Rabbih ibn Said fromMuhammad ibn Ibrahim ibn al-Harith at-Taymi that Nufay, a mukatab ofUmm Salama, the wife of the Prophet, may Allah bless him and grant himpeace, asked Zayd ibn Thabit for an opinion. He said, "I have divorcedmy free wife twice." Zayd ibn Thabit said, "She is haram for you."
USC-MSA web (English) reference: Book 29, Hadith 49
Arabic reference: Book 29, Hadith 1209