Among the Children of Israil there was retaliation but no blood money. So Allah Most High said to this community, "You who believe, retaliation is prescribed for you in the matter of the slain" [Baqarah 2:178]. Pardon here means that blood money is accepted in a case of deliberate killing. "Then let there be a fitting follow-up and payment to him in a good manner" [Baqarah 2:178], meaning the claimant pursues the matter fairly and the payer discharges it well. "That is a lightening from your Lord and a mercy" [Baqarah 2:178], compared with what was prescribed for those before you. "So whoever transgresses after that, for him is a painful punishment" [Baqarah 2:178], that is, he kills after having accepted the blood money.
كان في بني إسرائيل القصاص ولم تكن فيهم الدية، فقال الله تعالى لهذه الأمة: {يأيها الذين ءامنوا كتب عليكم القصاص في القتلى} فالعفو أن يقبل الدية في العمد، {فاتباع بالمعروف وأداء إليه بإحسن} يتبع بالمعروف ويؤدي بإحسان {ذلك تخفيف من ربكم ورحمة} مما كتب على من كان قبلكم {فمن اعتدى بعد ذلك فله عذاب أليم} قتل بعد قبول الدية.