Narrated from Sayyiduna Abdullah bin Abbas, may Allah be pleased with them both, he says: Allah Almighty said: {فَإِنْ جَائُ وْکَ فَاحْکُمْ بَیْنَہُمْ أَ وْ أَ عْرِضْ عَنْہُمْ، وَإِنْ تُعْرِضْ عَنْہُمْ فَلَنْ یَضُرُّوکَ شَیْئًا، وَإِنْ حَکَمْتَ فَاحْکُمْ بَیْنَہُمْ بِالْقِسْطِ، إِنَّ اللّٰہَیُحِبُّ الْمُقْسِطِینَ} … Then if they come to you, judge between them or turn away from them; and if you turn away from them, they will not harm you at all. But if you judge, judge between them with justice. Indeed, Allah loves those who act justly. The detail is that when Banu Nadir killed a slave of Banu Qurayza, they would pay half the blood money, and when Banu Qurayza killed someone from Banu Nadir, they would pay the full blood money. The Noble Prophet, peace and blessings be upon him, made them equal in the matter of blood money.