وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ خَالِدًا فِيهَا
Whoever intentionally kills a believer: his recompense is Hell, remaining therein. (Al-Nisāʾ 4:93)
The Muʿtazilī objection treats this as evidence for everlasting punishment of a person dying with a major sin. The Sunni reply examines fa-jazāʾuhu as an expression of liability and warning: that an offense warrants a penalty does not by itself resolve whether every penalty must be executed in full.
The warning must be interpreted alongside texts concerning faith, pardon, and intercession; the gravity of murder is not minimized.