4 verses have
kuntu
in Edition English Transliteration / Al-Ahqaf (The Dunes)

46:4Qul ara'aytum maa tad'oona min doonil laahi aroonee maazaa khalaqoo minal ardi am lahum shirkun fis samaawaati eetoonee bi kitaabim min qabli haazaaa aw asaaratim min 'ilmin in kuntum saadiqeen

46:9Qul maa kuntu bid'am minal Rusuli wa maaa adreee ma yuf'alu bee wa laa bikum in attabi'u illaa maa yoohaaa ilaiya ya maaa ana illaa nazeerum mubeen

46:20Wa Yawma yu'radul lazeena kafaroo 'alan Naai azhabtum taiyibaatikum fee hayaatikumud dunyaa wastam ta'tum bihaa fal Yawma tujzawna 'azaabal hooni bimaa kuntum tastakbiroona fil ardi bighairil haqqi wa bimaa kuntum tafsuqoon

46:34Wa Yawma yu'radul lazeena kafaroo 'alan naari alaisa haaza bil haqq; qaaloo balaa wa Rabbinaa; qaala fazooqul 'azaaba bimaa kuntum takfuroon