Jami` at-Tirmidhi, Volume 5, Book 40, Hadith 2707 (DarusSalam) ⓘ

Narrated Abu Dharr: that the Messenger of Allah said: "Whoever lifts the curtain so that his sight enters the house before he was given permission, and he seeks the nakedness of its inhabitants, then he has done something punishable which was not lawful for him to do. If it were that when he gazed into it, he was facing a man who lanced his eyes, there would be nothing wrong with him doing so. But if a man passes by a door that has no cover over it, and it is not closed and he looks, then there is no sin on him, the sin is only on the inhabitants of the house."

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا ابْنُ لَهِيعَةَ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي جَعْفَرٍ، عَنْ أَبِي عَبْدِ الرَّحْمَنِ الْحُبُلِيِّ، عَنْ أَبِي ذَرٍّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَنْ كَشَفَ سِتْرًا فَأَدْخَلَ بَصَرَهُ فِي الْبَيْتِ قَبْلَ أَنْ يُؤْذَنَ لَهُ فَرَأَى عَوْرَةَ أَهْلِهِ فَقَدْ أَتَى حَدًّا لاَ يَحِلُّ لَهُ أَنْ يَأْتِيَهُ لَوْ أَنَّهُ حِينَ أَدْخَلَ بَصَرَهُ اسْتَقْبَلَهُ رَجُلٌ فَفَقَأَ عَيْنَيْهِ مَا غَيَّرْتُ عَلَيْهِ وَإِنْ مَرَّ رَجُلٌ عَلَى بَابٍ لاَ سِتْرَ لَهُ غَيْرِ مُغْلَقٍ فَنَظَرَ فَلاَ خَطِيئَةَ عَلَيْهِ إِنَّمَا الْخَطِيئَةُ عَلَى أَهْلِ الْبَيْتِ ‏" ‏ ‏.‏ وَفِي الْبَابِ عَنْ أَبِي هُرَيْرَةَ وَأَبِي أُمَامَةَ ‏.‏ قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ لاَ نَعْرِفُهُ مِثْلَ هَذَا إِلاَّ مِنْ حَدِيثِ ابْنِ لَهِيعَةَ وَأَبُو عَبْدِ الرَّحْمَنِ الْحُبُلِيُّ اسْمُهُ عَبْدُ اللَّهِ بْنُ يَزِيدَ ‏.‏