It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) decreed that a Muslim will not be killed in retaliation for a disbeliever. In another narration: The blood money for a disbeliever is equal to half the blood money for a Muslim.
Hadith Takhrij«صحيح۔ أخرجه الترمذي: 1585، (انظر مسند أحمد ترقيم الرسالة: 7012 ترقیم بيت الأفكار الدولية: 7012»
Brief Explanation
Benefits: … The status of a Muslim and a disbeliever can never be equal, but Islam also does not approve of excess. Therefore, if a Muslim kills a disbeliever, then half the blood money (diyah) must be given to the heirs of the disbeliever.