The word(s) "نكث" appears in 5 verse(s) in Quran.

(1) فَلَمَّا كَشَفْنَا عَنْهُمُ الرِّجْزَ إِلَىٰ أَجَلٍ هُم بَالِغُوهُ إِذَا هُمْ يَنكُثُونَ

(سورة الأعراف, Al-A'raaf, Chapter #7, Verse #135)
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(2) وَإِن نَّكَثُوا أَيْمَانَهُم مِّن بَعْدِ عَهْدِهِمْ وَطَعَنُوا فِي دِينِكُمْ فَقَاتِلُوا أَئِمَّةَ الْكُفْرِ ۙ إِنَّهُمْ لَا أَيْمَانَ لَهُمْ لَعَلَّهُمْ يَنتَهُونَ

(سورة التوبة, At-Tawba, Chapter #9, Verse #12)
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(3) أَلَا تُقَاتِلُونَ قَوْمًا نَّكَثُوا أَيْمَانَهُمْ وَهَمُّوا بِإِخْرَاجِ الرَّسُولِ وَهُم بَدَءُوكُمْ أَوَّلَ مَرَّةٍ ۚ أَتَخْشَوْنَهُمْ ۚ فَاللَّهُ أَحَقُّ أَن تَخْشَوْهُ إِن كُنتُم مُّؤْمِنِينَ

(سورة التوبة, At-Tawba, Chapter #9, Verse #13)
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(4) فَلَمَّا كَشَفْنَا عَنْهُمُ الْعَذَابَ إِذَا هُمْ يَنكُثُونَ

(سورة الزخرف, Az-Zukhruf, Chapter #43, Verse #50)
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(5) إِنَّ الَّذِينَ يُبَايِعُونَكَ إِنَّمَا يُبَايِعُونَ اللَّهَ يَدُ اللَّهِ فَوْقَ أَيْدِيهِمْ ۚ فَمَن نَّكَثَ فَإِنَّمَا يَنكُثُ عَلَىٰ نَفْسِهِ ۖ وَمَنْ أَوْفَىٰ بِمَا عَاهَدَ عَلَيْهُ اللَّهَ فَسَيُؤْتِيهِ أَجْرًا عَظِيمًا

(سورة الفتح, Al-Fath, Chapter #48, Verse #10)
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