﴿ وَمَن يَقْتُلْ مُؤْمِنًۭا مُّتَعَمِّدًۭا فَجَزَآؤُهُۥ جَهَنَّمُ خَٰلِدًۭا فِيهَا وَغَضِبَ ٱللَّهُ عَلَيْهِ وَلَعَنَهُۥ وَأَعَدَّ لَهُۥ عَذَابًا عَظِيمًۭا ﴾

“But whoever deliberately slays another be­liever, his requital shall be hell, therein to abide; and God will condemn him, and will reject him, and will prepare for him awesome suffering.”

Then Allah revealed about Miqyas Ibn Sababah, the killer of al-Fihri, the emissary of Allah's Messenger (pbuh) who, after taking the blood money for the killing of his brother Hisham Ibn Sababah, left Islam and fled to Mecca, saying: (Whoso slayeth a believer of set purpose, his reward is hell) for this wilful killing (for ever) due to his idolatry. (Allah is wroth against him) for taking the blood money (and He hath cursed him) because he killed a person who did not kill his brother (and prepared for him an awful doom) because of his boldness towards Allah.