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 believe, QiSāS has been prescribed for you in the case of murdered people: The freeman (will be killed) for the freeman, the slave for the slave, and the female for the female. However, if one is somewhat forgiven by his brother, the recourse (of the latter) is to pursue the former (for blood money) with fairness, and the obligation (of the former) is to pay (it) to the latter in a nice way. That is a relief from your Lord, and a mercy. So, whoever transgresses after all that will have a painful punishment.