3 verses have
yakun
in Edition English Transliteration / An-Nisaa (The Women)

4:38Wallazeena yunfiqoona amwaalahum ri'aaa'an naasi wa laa yu'minoona billaahi wa laa bil Yawmil Aakhir; wa mai yakunish shaitaanu lahoo qareenan fasaaa'a qareenaa

4:135Yaa aiyuhal lazeena aamanoo koonoo qawwa ameena bilqisti shuhadaaa'a lillaahi wa law 'alaa anfusikum awil waalidaini wal aqrabeen iny yakun ghaniyyan aw faqeeran fallaahu awlaa bihimaa falaaa tattabi'ul hawaaa an ta'diloo; wa in talwooo aw tu'ridoo fa innal laaha kaana bimaa ta'maloona Khabeera

4:137Innal lazeena aamanoo summa kafaroo summa aamanoo summa kafaroo summaz daado kufral lam yakunil laahu liyaghfira lahum wa laa liyahdiyahum sabeelaa