مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2357
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) returned his daughter Zainab to Abul-'As bin ar-Rabee', although she became Muslim six years before him, on the basis of the previous marriage contract, and he did not repeat the marriage contract with witnesses and a dowry.
Musnad Ahmad 2366Its isnad is hasan]