Maliks Muwatta Book 29, Hadith Number 11.

Section : What is Clear about Giving Wives Right of Divorce.

Yahya related to me from Malik from Nafi that Abdullah ibn Umar said, “When a man gives a woman command over herself, then the result is as she decides unless he denies it and says that he only meant to give her one divorce and he swears to it – then he has access to her while she is in her idda.”