Abd al-Rahman, the son of Abu Sa'id al-Khudri, reported from his father:
The Messenger of Allah (ﷺ) said: A man should not see the private parts of another man, and a woman should not see the private parts of another woman, and a man should not lie with another man under one covering, and a woman should not lie with another woman under one covering.
Reference: Sahih Muslim 338 a In-book : Book 3, Hadith 90 USC-MSA web (English) : Book 3, Hadith 667 (deprecated)
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