قَوْلُهُ تَعَالَى: {يَا أَيُّهَا الَّذِينَ آمَنُوا كُتِبَ عَلَيْكُمُ الْقِصَاصُ} [البقرة: 178]
[Machine] Retribution was practiced among the children of Israel, and they did not have the option of blood money. So, Allah, blessed and exalted, said to this nation, "O you who have believed, prescribed for you is legal retribution for those murdered - the free for the free..." (Al-Baqarah 2:178) until His saying, "But whoever overlooks from his brother anything, then there should be a suitable follow-up and payment to him [compensation]" (Al-Baqarah 2:178). So forgiveness is that blood money is accepted for intentional killing, and following the custom is to follow this with a fitting custom, and fulfilling this with excellence. So, leniency was granted to this nation...
كَانَ الْقِصَاصُ فِي بَنِي إِسْرَائِيلَ وَلَمْ يَكُنْ فِيهِمُ الدِّيَةُ فَقَالَ اللهُ تَبَارَكَ وَتَعَالَى لِهَذِهِ الْأُمَّةِ {يَا أَيُّهَا الَّذِينَ آمَنُوا كُتِبَ عَلَيْكُمُ الْقِصَاصُ فِي الْقَتْلَى الْحُرُّ بِالْحُرِّ} [البقرة 178] إِلَى قَوْلِهِ {فَمَنْ عُفِيَ لَهُ مِنْ أَخِيهِ شَيْءٌ} [البقرة 178] فَالْعَفْوُ أَنْ تُقْبَلَ الدِّيَةُ فِي الْعَمْدِ وَاتِّبَاعُ الْمَعْرُوفِ أَنْ تَتْبَعَ هَذَا بِمَعْرُوفٍ وَتُؤَدِّي هَذَا بِإِحْسَانٍ فَخُفِّفَ عَنْ هَذِهِ الْأُمَّةِ