a Muslim is considered superior to that of a non-Muslim

In Islamic law the life of a Muslim is considered superior to that of a non-Muslim, so much so that whilst a non-Muslim killing a Muslim would be executed, the reverse would not occur.

Sahih Al-Bukhari Hadith 9.50 Narrated by Abu Juhaifa
I asked ‘Ali “Do you have anything Divine literature besides what is in the Qur’an?” Or, as Uyaina once said, “Apart from what the people have?” ‘Ali said, “By Him Who made the grain split (germinate) and created the soul, we have nothing except what is in the Qur’an and the ability (gift) of understanding Allah’s Book which He may endow a man with, and what is written in this sheet of paper.” I asked, “What is on this paper?” He replied, “The legal regulations of Diya (Blood-money) and the (ransom for) releasing of the captives, and the judgment that no Muslim should be killed in Qisas (equality in punishment) for killing a Kafir (disbeliever).”