Surah An-Nahl Verse 126 - English Translation by Muhammad Asad
Surah An-Nahlوَإِنۡ عَاقَبۡتُمۡ فَعَاقِبُواْ بِمِثۡلِ مَا عُوقِبۡتُم بِهِۦۖ وَلَئِن صَبَرۡتُمۡ لَهُوَ خَيۡرٞ لِّلصَّـٰبِرِينَ
Hence, if you have to respond to an attack (in argument], respond only to the extent of the attack levelled against you; but to bear yourselves with patience is indeed far better for (you, since God is with] those who are patient in adversity