مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2081
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated from Ibn ‘Abbas that the Messenger of Allah (ﷺ) got up at night and relieved himself, then he washed his face and hands and went back to sleep.
Musnad Ahmad 2083Its isnad is saheeh , al Bukhari (138) and Muslim (763)]