Surah Al-Ma'idah — Ayah 118 (5:118)
إِن تُعَذِّبۡهُمۡ فَإِنَّهُمۡ عِبَادُكَۖ وَإِن تَغۡفِرۡ لَهُمۡ فَإِنَّكَ أَنتَ ٱلۡعَزِيزُ ٱلۡحَكِيمُ ١١٨
English translation (Saheeh International)
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."
Brief commentary
If you punish them, O Lord, they are your servants and You can do with them as You wish. If You graciously forgive those of them who had faith, nothing can stop You from doing so because You are the Mighty, Who cannot be overpowered, and the Wise in Your handling of matters.