Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahmanthat al-Qasim ibn Muhammad and Urwa ibn az-Zubayr said that a man whohad four wives and then divorced one of them irrevocably, could marrystraightaway if he wished, and he did not have to wait for thecompletion of her idda.
USC-MSA web (English) reference: Book 28, Hadith 54
Arabic reference: Book 28, Hadith 1149