Al-Baqarah 2:178 يا ايها الذين امنوا كتب عليكم القصاص في القتلى الحر بالحر والعبد بالعبد والانثى بالانثى فمن عفي له من اخيه شيء فاتباع بالمعروف واداء اليه باحسان ذالك تخفيف من ربكم ورحمة فمن اعتدى بعد ذالك فله عذاب اليم ١٧٨

O you who have believed, prescribed for you is legal retribution for those murdered - the free for the free, the slave for the slave, and the female for the female.¹ But whoever overlooks from his brother [i.e., the killer] anything,² then there should be a suitable follow-up and payment to him [i.e., the deceased's heir or legal representative] with good conduct. This is an alleviation from your Lord and a mercy. But whoever transgresses after that³ will have a painful punishment.