Musnad Ahmad 25:1113

Al-Zubayri and Aswad ibn Amir narrated to us, they said: Isra’il narrated to us, from Simak, from Ikrimah, from Ibn Abbas, who said: A woman accepted Islam during the time of the Messenger of Allah, peace and blessings of Allah be upon him, and she married. Then her first husband came to the Prophet, peace and blessings of Allah be upon him, and said: "O Messenger of Allah, I had accepted Islam and [the people] knew of my Islam." So the Prophet, peace and blessings of Allah be upon him, removed her from her other husband and returned her to her first husband.