Surah An-Nahl, Verse 126

وَإِنۡ عَاقَبۡتُمۡ فَعَاقِبُواْ بِمِثۡلِ مَا عُوقِبۡتُم بِهِۦۖ وَلَئِن صَبَرۡتُمۡ لَهُوَ خَيۡرٞ لِّلصَّٰبِرِينَ١٢٦

wa-in ʿāqabtum faʿāqibū bimith'li mā ʿūqib'tum bihi wala-in ṣabartum lahuwa khayrun lilṣṣābirīna

And if you punish [an enemy, O believers], punish with an equivalent of that with which you were harmed. But if you are patient - it is better for those who are patient.