وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ مَرْوَانَ بْنَ الْحَكَمِ، كَتَبَ إِلَى مُعَاوِيَةَ بْنِ أَبِي سُفْيَانَ أَنَّهُ أُتِيَ بِمَجْنُونٍ قَتَلَ رَجُلاً ‏.‏ فَكَتَبَ إِلَيْهِ مُعَاوِيَةُ أَنِ اعْقِلْهُ وَلاَ تُقِدْ مِنْهُ فَإِنَّهُ لَيْسَ عَلَى مَجْنُونٍ قَوَدٌ ‏.‏ قَالَ مَالِكٌ فِي الْكَبِيرِ وَالصَّغِيرِ إِذَا قَتَلاَ رَجُلاً جَمِيعًا عَمْدًا أَنَّ عَلَى الْكَبِيرِ أَنْ يُقْتَلَ وَعَلَى الصَّغِيرِ نِصْفُ الدِّيَةِ ‏.‏ قَالَ مَالِكٌ وَكَذَلِكَ الْحُرُّ وَالْعَبْدُ يَقْتُلاَنِ الْعَبْدَ فَيُقْتَلُ الْعَبْدُ وَيَكُونُ عَلَى الْحُرِّ نِصْفُ قِيمَتِهِ ‏.‏

Yahya related to me from Malik from Yahya ibn Said that Marwan ibn al-Hakam wrote to Muawiya ibn Abi Sufyan that a madman was brought to him who had killed a man. Muawiya wrote to him, "Tie him up and do not inflict any retaliation on him. There is no retaliation against a madman." Malik said about an adult and a child when they murder a man together, "The adult is killed and the child pays half the full blood-money." Malik said, "It is like that with a freeman and a slave when they murder a slave. The slave is killed and the freeman pays half of his value