Yahya related to me from Malik that Yahya ibn Said said that hehad heard al-Qasim ibn Muhammad say that Zayd ibn Abd al-Malikseparated some men and their wives who were slave-girls who had bornechildren to men who had died, because they had married them after oneor two menstrual periods. He separated them until they had done anidda of four months and ten days. Al-Qasim ibn Muhammad said, "Glorybe to Allah! Allah says in His Book, 'Those of you who die, leavingwives, they are not wives.' "
USC-MSA web (English) reference: Book 29, Hadith 91
Arabic reference: Book 29, Hadith 1255