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  

“Whoever kills deliberately, he will be handed over to the heirs of the victim. If they want, they may kill him, or if they want, they may accept the blood money, which is thirty Hiqqah, thirty Jadha'ah and forty Khalifah. This is the blood money for deliberate slaying. Whatever is settled by reconciliation belongs to them, and that is a binding covenant.”  

قَالَ رَسُولُ اللَّهِ ﷺ مَنْ قَتَلَ عَمْدًا دُفِعَ إِلَى أَوْلِيَاءِ الْقَتِيلِ فَإِنْ شَاءُوا قَتَلُوا وَإِنْ شَاءُوا أَخَذُوا الدِّيَةَ وَذَلِكَ ثَلاَثُونَ حِقَّةً وَثَلاَثُونَ جَذَعَةً وَأَرْبَعُونَ خَلِفَةً وَذَلِكَ عَقْلُ الْعَمْدِ مَا صُولِحُوا عَلَيْهِ فَهُوَ لَهُمْ وَذَلِكَ تَشْدِيدُ الْعَقْلِ  

[Machine] The Prophet ﷺ said: "Whoever deliberately kills someone, it is the responsibility of the relatives of the victim to decide whether to kill the perpetrator or to accept blood money. The blood money is thirty camels, thirty cows, and forty young sheep. This is the compensation for intentional murder. Whatever agreement they come to is valid and binding. This is to ensure fairness. The Messenger of Allah ﷺ also said: "The intellect of the one who acts like a madman becomes firm, just like the intellect of a sane person. However, the one who acts like a madman should not be killed. This is because the devil may influence people and cause them to act foolishly, without anger or carrying a weapon."  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنْ قَتَلَ مُتَعَمِّدًا دُفِعَ إِلَى أَوْلِيَاءِ الْمَقْتُولِ فَإِنْ شَاءُوا قَتَلُوهُ وَإِنْ شَاءُوا أَخَذُوا الدِّيَةَ وَهِيَ ثَلَاثُونَ حِقَّةً وَثَلَاثُونَ جَذَعَةً وَأَرْبَعُونَ خَلِفَةً وَذَلِكَ عَقْلُ الْعَمْدِ وَمَا صُولِحُوا عَلَيْهِ فَهُوَ لَهُمْ وَذَلِكَ تَشْدِيدُ الْعَقْلِ وَأَنَّ رَسُولَ اللهِ ﷺ قَالَ عَقْلُ شِبْهِ الْعَمْدِ مُغَلَّظَةٌ مِثْلُ عَقْلِ الْعَمْدِ وَلَا يُقْتَلُ صَاحِبُهُ وَذَلِكَ أَنْ يَنْزُوَ الشَّيْطَانُ بَيْنَ النَّاسِ فَيَكُونَ رِمِّيَّا فِي عِمِّيَّا فِي غَيْرِ ضَغِينَةٍ وَلَا حَمْلِ سِلَاحٍ  

“Whoever kills deliberately, he will be handed over to the heirs of the victim. If they want, they may kill him, or if they want, they may accept the blood money, which is thirty Hiqqah, thirty Jadha'ah and forty Khalifah. This is the blood money for deliberate slaying. Whatever is settled by reconciliation belongs to them, and that is a binding covenant.” (Using translation from Ibn Mājah 2626)   

قَالَ النَّبِيُّ ﷺ مَنْ قَتَلَ عَمْدًا دُفِعَ إِلَى وَلِيِّ الْمَقْتُولِ فَإِنْ شَاءَ قَتَلَهُ وَإِنْ شَاءَ أَخَذَ الدِّيَةَ وَهِيَ ثَلَاثُونَ حِقَّةً وَثَلَاثُونَ جَذَعَةً وَأَرْبَعُونَ خَلِفَةً وَذَلِكَ عَقْلُ الْعَمْدِ وَمَا صُولِحُوا عَلَيْهِ فَهُوَ لَهُمْ وَذَلِكَ تَشْدِيدُ الْعَقْلِ  

"مَنْ قَتَلَ مُتَعمِّدًا دُفِعَ إِلَى أَوْلِيَاءِ الْمقْتُولِ، فَإِنْ شَاءُوا قَتلوا وإِنْ شَاءُوا أَخَذُوا الدِّيَةَ وَهِي ثَلاثُونَ حِقَّةً، وثَلاثُونَ جَذَعَةً، وأَربعون خَلفةً، ومَا صُولِحُوا عَلَيهِ فَهُو لَهُمْ".  

"مَنْ قَتَلَ مُتَعَمِّدًا، فَإِنَّهُ يُدْفعُ إِلى أَهْلِ الْقَتِيلِ، فَإنْ شَاءُوا قَتلوا وإنْ شَاءُوا أخَذُوا العَقْلَ، دِيةً مُسَلَّمَة، وهِيَ مِائَة من الإبلِ ثلاثون حَقَّةً، وثلاثون جَذَعَةً، وَأَرْبَعُونَ خَلِفة، فذلك العَمد إِذَا لَمْ يَقْتُلْ صَاحَبِه".