مُسْنَدُ أَحْمَدَ
Musnad Ahmad 2851
Musnad of 'Abdullah bin al-'Abbas bin 'Abdul-Muttalib from the Prophet
It was narrated that Ibn ‘Abbas (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: “No man should be under the same cover as another man and no woman (should be under the same over) as another woman.”
Musnad Ahmad 2871A saheeh hadeeth]