The word(s) "nakun" appears 4 time(s) in 4 verse(s) in Quran.

(1) Allatheena yatarabbasoona bikum fain kana lakum fathun mina Allahi qaloo alam nakun maAAakum wain kana lilkafireena naseebun qaloo alam nastahwith AAalaykum wanamnaAAkum mina almumineena faAllahu yahkumu baynakum yawma alqiyamati walan yajAAala Allahu lilkafireena AAala almumineena sabeelan

(سورة النساء, An-Nisaa, Chapter #4, Verse #141)
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(2) Waitha onzilat sooratun an aminoo biAllahi wajahidoo maAAa rasoolihi istathanaka oloo alttawli minhum waqaloo tharna nakun maAAa alqaAAideena

(سورة التوبة, At-Tawba, Chapter #9, Verse #86)
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(3) Min dooni Allahi qaloo dalloo AAanna bal lam nakun nadAAoo min qablu shayan kathalika yudillu Allahu alkafireena

(سورة غافر, Ghafir, Chapter #40, Verse #74)
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(4) Yunadoonahum alam nakun maAAakum qaloo bala walakinnakum fatantum anfusakum watarabbastum wairtabtum wagharratkumu alamaniyyu hatta jaa amru Allahi wagharrakum biAllahi algharooru

(سورة الحديد, Al-Hadid, Chapter #57, Verse #14)
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