Mishkat al-Masabih #3000
Marriage
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ الْحَسَنِ مُرْسَلًا قَالَ: بَلَغَنِي أَنَّ رَسُولَ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَعَنَ اللَّهُ النَّاظِرَ وَالْمَنْظُورَ إِلَيْهِ» . رَوَاهُ الْبَيْهَقِيُّ فِي شُعَبِ الْإِيمَانِ
Al-Hasan told in mursal form that he heard God’s Messenger had said, “God curse the one who looks and the one who is looked at!”
Baihaqi transmitted it in Shu'ab al-iman.
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About Mishkat al-Masabih
This hadith is #3000 from Mishkat al-Masabih, in the Book of Marriage.