The word(s) "أهلكناهم" appears in 7 verse(s) in Quran.

(1) أَلَمْ يَرَوْا كَمْ أَهْلَكْنَا مِن قَبْلِهِم مِّن قَرْنٍ مَّكَّنَّاهُمْ فِي الْأَرْضِ مَا لَمْ نُمَكِّن لَّكُمْ وَأَرْسَلْنَا السَّمَاءَ عَلَيْهِم مِّدْرَارًا وَجَعَلْنَا الْأَنْهَارَ تَجْرِي مِن تَحْتِهِمْ فَأَهْلَكْنَاهُم بِذُنُوبِهِمْ وَأَنشَأْنَا مِن بَعْدِهِمْ قَرْنًا آخَرِينَ

(سورة الأنعام, Al-An'aam, Chapter #6, Verse #6)
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(2) كَدَأْبِ آلِ فِرْعَوْنَ ۙ وَالَّذِينَ مِن قَبْلِهِمْ ۚ كَذَّبُوا بِآيَاتِ رَبِّهِمْ فَأَهْلَكْنَاهُم بِذُنُوبِهِمْ وَأَغْرَقْنَا آلَ فِرْعَوْنَ ۚ وَكُلٌّ كَانُوا ظَالِمِينَ

(سورة الأنفال, Al-Anfaal, Chapter #8, Verse #54)
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(3) وَتِلْكَ الْقُرَىٰ أَهْلَكْنَاهُمْ لَمَّا ظَلَمُوا وَجَعَلْنَا لِمَهْلِكِهِم مَّوْعِدًا

(سورة الكهف, Al-Kahf, Chapter #18, Verse #59)
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(4) وَلَوْ أَنَّا أَهْلَكْنَاهُم بِعَذَابٍ مِّن قَبْلِهِ لَقَالُوا رَبَّنَا لَوْلَا أَرْسَلْتَ إِلَيْنَا رَسُولًا فَنَتَّبِعَ آيَاتِكَ مِن قَبْلِ أَن نَّذِلَّ وَنَخْزَىٰ

(سورة طه, Taa-Haa, Chapter #20, Verse #134)
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(5) فَكَذَّبُوهُ فَأَهْلَكْنَاهُمْ ۗ إِنَّ فِي ذَ‌ٰلِكَ لَآيَةً ۖ وَمَا كَانَ أَكْثَرُهُم مُّؤْمِنِينَ

(سورة الشعراء, Ash-Shu'araa, Chapter #26, Verse #139)
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(6) أَهُمْ خَيْرٌ أَمْ قَوْمُ تُبَّعٍ وَالَّذِينَ مِن قَبْلِهِمْ ۚ أَهْلَكْنَاهُمْ ۖ إِنَّهُمْ كَانُوا مُجْرِمِينَ

(سورة الدخان, Ad-Dukhaan, Chapter #44, Verse #37)
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(7) وَكَأَيِّن مِّن قَرْيَةٍ هِيَ أَشَدُّ قُوَّةً مِّن قَرْيَتِكَ الَّتِي أَخْرَجَتْكَ أَهْلَكْنَاهُمْ فَلَا نَاصِرَ لَهُمْ

(سورة محمد, Muhammad, Chapter #47, Verse #13)
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