Hadith 1497B1

قَالَ مَالِك، فِي الْكَبِيرِ وَالصَّغِيرِ إِذَا قَتَلَا رَجُلًا جَمِيعًا عَمْدًا : أَنَّ عَلَى الْكَبِيرِ أَنْ يُقْتَلَ، وَعَلَى الصَّغِيرِ نِصْفُ الدِّيَةِ . قَالَ مَالِك : وَكَذَلِكَ الْحُرُّ وَالْعَبْدُ يَقْتُلَانِ الْعَبْدَ فَيُقْتَلُ الْعَبْدُ وَيَكُونُ عَلَى الْحُرِّ نِصْفُ قِيمَتِهِ
Imam Malik, may Allah have mercy on him, said that if an adult and a minor together intentionally kill a person, then retribution (qisas) will be taken from the adult, and half of the blood money (diyah) will be obligatory upon the minor.

Imam Malik, may Allah have mercy on him, said that similarly, if a free person and a slave together intentionally kill a slave, then the slave will be killed in retribution, and the free person will be liable for half the value of that slave.
Hadith Reference موطا امام مالك رواية يحييٰ / كتاب العقول / 1497B1
Hadith Takhrij «فواد عبدالباقي نمبر: 43 - كِتَابُ الْعُقُولِ-ح: 3»