Abu Dawud Book 6, Hadith Number 2231.
Chapter : Not known.
Narated By Abdullah ibn Abbas : A woman embraced Islam during the time of the Apostle of Allah (PBUH); she then married. Her (former) husband then came to the Prophet (PBUH) and said: Apostle of Allah, I have already embraced Islam, and she had the knowledge about my Islam. The Apostle of Allah (PBUH) took her away from her latter husband and restored her to her former husband.