مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2217
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 one witness and an oath.
Musnad Ahmad 2224Its isnad is saheeh, Muslim (1712)]