Musannaf Ibn Abi Shayba 20:49

Abu Bakr narrated to us, he said: 'Abdah bin Sulayman narrated to us, from Sa'id bin Abi 'Arubah, from the one who narrated to him, from Yahya bin Abi Kathir, from Abu al-Hasan, a freed slave of Banu Nawfal, who said: "I and my wife were slaves, and I divorced her twice. Then we were freed afterwards, and I wanted to take her back. So I went to Ibn Abbas and asked him about taking her back. He said: 'If you take her back, she is with you upon one [remaining divorce], and two have passed. The Messenger of Allah (ﷺ) decreed that.'"