"The Messenger of Allah ﷺ judged for the accidental blood-Money: Twenty Bint Makhad, twenty make Ibn Makhad, twenty Bint Labunm twenty Jadha'ah, and twenty Hiqqah. (Another chain) with similar meaning.  

قَضَى رَسُولُ اللَّهِ ﷺ فِي دِيَةِ الْخَطَإِ عِشْرِينَ بِنْتَ مَخَاضٍ وَعِشْرِينَ بَنِي مَخَاضٍ ذُكُورًا وَعِشْرِينَ بِنْتَ لَبُونٍ وَعِشْرِينَ جَذَعَةً وَعِشْرِينَ حِقَّةً قَالَ وَفِي الْبَابِ عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو حَدَّثَنَا أَبُو هِشَامٍ الرِّفَاعِيُّ أَخْبَرَنَا ابْنُ أَبِي زَائِدَةَ وَأَبُو خَالِدٍ الأَحْمَرُ عَنِ الْحَجَّاجِ بْنِ أَرْطَاةَ نَحْوَهُ  

from his father, from his grandfather that the Prophet ﷺ said: "Whoever kills [a believer] deliberately, he is handed over to the guardians of the one killed. If they wish to, they have him killed, and if they wish to, they take the blood-money. That is thirty Hiqqah, thirty Jadha'ahs and forty pregnant camels. Whatever (amount more) they require from him, than that is for them (if they choose)." THat is because of the severity of blood-money.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ قَتَلَ مُؤْمِنًا مُتَعَمِّدًا دُفِعَ إِلَى أَوْلِيَاءِ الْمَقْتُولِ فَإِنْ شَاءُوا قَتَلُوا وَإِنْ شَاءُوا أَخَذُوا الدِّيَةَ وَهِيَ ثَلاَثُونَ حِقَّةً وَثَلاَثُونَ جَذَعَةً وَأَرْبَعُونَ خَلِفَةً وَمَا صَالَحُوا عَلَيْهِ فَهُوَ لَهُمْ وَذَلِكَ لِتَشْدِيدِ الْعَقْلِ