مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3267
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas (رضي الله عنه) that The Messenger of Allah (ﷺ) sent his daughter Zainab back to her husband al-'As on the basis of their first marriage contract after two years, and he did not stipulate a new dowry.
Musnad Ahmad 3290Its isnad is hasan]