Musnad Ahmad 25:1431

Yazid narrated to us, he said: Muhammad ibn Ishaq informed us, from Dawud ibn Husayn, from Ikrimah, from Ibn Abbas: "That the Messenger of Allah, may Allah bless him and grant him peace, returned his daughter Zaynab to Abu al-Aas, her husband, by her first marriage contract after two years, and he did not establish a new dowry."