Surah Ash-Shuraa — Ayah 41 (42:41)
وَلَمَنِ ٱنتَصَرَ بَعۡدَ ظُلۡمِهِۦ فَأُوْلَٰٓئِكَ مَا عَلَيۡهِم مِّن سَبِيلٍ ٤١
English translation (Saheeh International)
And whoever retaliates after having been wronged - those have not upon them any cause [for blame].
Brief commentary
For those who defend themselves, there will be no blame as they had taken their right.