Hadith
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ كَانَ يَقُولُ لَيْسَ عَلَى الْعَاقِلَةِ عَقْلٌ فِي قَتْلِ الْعَمْدِ إِنَّمَا عَلَيْهِمْ عَقْلُ قَتْلِ الْخَطَإِ .
Yahya related to me from Malik from Hisham ibn Urwa that his father said, "The tribe is not obliged to pay blood-money for intentional murder. They pay blood-money for accidental killing
Sahih · Salim al-Hilali
Muwatta Malik 1581 ·Book 43, Hadith 30·Also available on sunnah.com·