مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2030
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
Abu Hasan, the freed slave of Abu Nawfal, narrated that he asked Ibn ‘Abbas about a slave man who is married to a slave woman and divorces her twice (two talaqs), then they are both manumitted: can he propose to her? He said: Yes, the Messenger of Allah (ﷺ) passed a verdict to that effect.
Musnad Ahmad 2031Its isnad is da'eef and Umar bin Mu'attib is da’eef]