مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2865
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) passed judgement on the basis of a witness and an oath.
Musnad Ahmad 2886Its isnad is saheeh, Muslim (1712)]