Hadith 45936

وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَا يَنْظُرُ الرَّجُلُ إِلَى عَوْرَةِ الرَّجُلِ وَلَا الْمَرْأَةُ إِلَى عَوْرَةِ الْمَرْأَةِ وَلَا يُفْضِي الرَّجُلُ إِلَى الرَّجُلِ فِي ثَوْبٍ وَاحِدٍ وَلَا تُفْضِي الْمَرْأَةُ إِلَى الْمَرْأَةِ فِي ثوب وَاحِد» . رَوَاهُ مُسلم

Abu Sa'id reported God’s Messenger as saying, “A man must not look at a man’s private parts or a woman at a woman’s, and a man must not come close to a man in one garment or a woman to a woman in one garment.” Muslim transmitted it.

Source: Mishkat al-Masabih — repository translation · Al-Khatib Al-Tabrizi — authenticity/grade metadata requires independent source review · Sunnah.com
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Source: Mishkat al-Masabih — repository arabic · Al-Khatib Al-Tabrizi · Sunnah.com