3 verses have
kuntum
in Edition English Transliteration / Al-Ankaboot (The Spider)

29:8Wa wassainal insaana biwaalidaihi husnanw wa in jaahadaaka litushrika bee maa laisa laka bihee 'ilmun falaa tuti'humaa; ilaiya marji'ukum fa unabbi'ukum bimaa kuntum ta'maloon

29:16Wa Ibraheema iz qaala liqawmihi' budul laaha wattaqoohu zaalikum khayrul lakum in kuntum ta'lamoon

29:55Yawma yaghshaahumul 'azaabu min fawqihim wa min tahti arjulim wa yaqoolu zooqoo maa kuntum ta'maloon