Divorced women shall wait concerning themselves for three monthly periods. Nor is it lawful for them to hide what Allah hath created in their wombs. This means that if a man divorced his wife he had the right to take her back in marriage though he had divorced her by three pronouncements. This was then repealed (by a Qur'anic verse). Divorce is only permissible twice.
Reference: Sunan Abi Dawud 2195 In-book : Book 13, Hadith 21 English translation : Book 12, Hadith 2190
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