Sahih al-Bukhari 5792

'Urwa ibn az-Zubayr related that 'A'isha said, "The wife of Rifa'a al-Qurazi came to the Messenger of Allah, may Allah bless him and grant him peace, while I was sitting there and Abu Bakr was with him. She said, "I was married to Rifa'a and he divorced me and it was a final divorce. I then married 'Abdu'r-Rahman ibn az-Zubayr, but he is like this fringe, and she took hold of the fringe of her outer wrapper (jilbab). Khalid ibn Sa'id, who was at the door and had not been given permission to enter, heard what she said and said, 'Abu Bakr, will you not stop this woman from saying that openly in the presence of the Messenger of Allah, may Allah bless him and grant him peace?' By Allah, the Messenger of Allah, may Allah bless him and grant him peace, did not do more than smile. The Messenger of Allah, may Allah bless him and grant him peace, said to her, 'Do you want to return to Rifa'a? No, not until you have enjoyed his sweetness and he ('Abdu'r-Rahman) has enjoyed your sweetness.' That has become the sunna ever since.*" [*The sunna is that she cannot return to her first husband who divorced her with a final divorce until she has consummated a marriage with another husband.]