According to search-discovered classical Islamic scholarship, the deliberate killing of a believer (Al-Qatl al-'Amd lil-Mu'min) is one of the most severe major sins, invoking a direct and multifaceted punishment from Allah. The definitive ruling in Quran 4:93 specifies a fivefold recompense: 1) Hellfire (Jahannam), 2) eternal residence within it, 3) the wrath of Allah (Ghadab), 4) His curse (La'nah), and 5) a great torment ('Adhab 'Azim) specifically prepared for the perpetrator. Classical authorities like Imam Al-Qurtubi and Ibn Kathir emphasize that this verse serves as the most severe threat mentioned in the Quran for any sin after disbelief. While some early scholars like Ibn Abbas held that the murderer's repentance is not accepted, the majority scholarly consensus is that sincere repentance is possible, though it does not negate the worldly legal consequences (Qisas) or the rights of the victim's family. The synthesis of this single, powerful verse establishes the absolute sanctity of a believer's life and the severe, multi-layered divine consequences of its intentional violation.