Hazrat Umar bin Abdul Aziz said that the blood money (diyah) of a Jew or a Christian is half of the blood money of a free Muslim.
Imam Malik, may Allah have mercy on him, said: According to us, the ruling is that no Muslim will be killed in retaliation for a disbeliever, except when the Muslim kills him deceitfully by trickery, then he will be killed.
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب العقول / 1521