Surah Al-Ma'idah, ayah 118

5:118

إِن تُعَذِّبۡهُمۡ فَإِنَّهُمۡ عِبَادُكَۖ وَإِن تَغۡفِرۡ لَهُمۡ فَإِنَّكَ أَنتَ ٱلۡعَزِيزُ ٱلۡحَكِيمُ ١١٨

In tu'addhibhum fa innahum 'ibāduka wa in taghfir lahum fa innaka antal-'azīzul-hakīm

If You should punish them - indeed they are Your servants; but if You forgive them - indeed it is You who is the Exalted in Might, the Wise."