Sura al-Baqara 2:178

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُتِبَ عَلَيْكُمُ ٱلْقِصَاصُ فِى ٱلْقَتْلَى ٱلْحُرُّ بِٱلْحُرِّ وَٱلْعَبْدُ بِٱلْعَبْدِ وَٱلْأُنثَىٰ بِٱلْأُنثَىٰ فَمَنْ عُفِىَ لَهُۥ مِنْ أَخِيهِ شَىْءٌ فَٱتِّبَاعٌۢ بِٱلْمَعْرُوفِ وَأَدَآءٌ إِلَيْهِ بِإِحْسَٰنٍ ذَٰلِكَ تَخْفِيفٌ مِّن رَّبِّكُمْ وَرَحْمَةٌ فَمَنِ ٱعْتَدَىٰ بَعْدَ ذَٰلِكَ فَلَهُۥ عَذَابٌ أَلِيمٌ

yā-ayyuhā lladhīna āmanū kutiba ʿalaykumu l-qiṣāṣu fī l-qatlā l-ḥurru bil-ḥurri wa-l-ʿabdu bil-ʿabdi wa-l-unthā bil-untha fa-man ʿufīa lahu min akhīhi shayʾun fa-attibāʿun bil-maʿrūfi wa-adāun ilayhi bi-iḥsānin dhālika takhfīfun min rabbikum wa-raḥmatun fa-mani aʿtada baʿda dhālika fa-lahu ʿadhābun alīmun

O ye who believe! the law of equality is prescribed to you in cases of murder: the free for the free, the slave for the slave, the woman for the woman. But if any remission is made by the brother of the slain, then grant any reasonable demand, and compensate him with handsome gratitude, this is a concession and a Mercy from your Lord. After this whoever exceeds the limits shall be in grave penalty.