Translation:

93. If a man kills a believer intentionally his recompense is Hell to abide therein (for ever): and the wrath and the curse of Allah are upon him and a dreadful penalty is prepared for him.

Notes (Tafseer)

612. What is mentioned here is the punishment in the Hereafter. The legal consequences, enforceable by human society, are mentioned in ii. 178, under the rules of Qisas. That is, a life should be taken for a life destroyed, but this should be on a scale of equality: a single murder should not commit a whole tribe to a perpetual blood-feud, as in the days of ignorance. But if the heirs of the man slain accept reasonable compensation, this should be accepted, and the taking of a life for a life should be put a stop to. This course leads to the saving of life, and is commanded to men of understanding.