مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3392
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: On the day of at-Ta’if, the Messenger of Allah (ﷺ) manumitted whoever of the slaves of the mushrikeen came out to him.
Musnad Ahmad 3415Hasan because of corroborating evidence; this is a da'eef is