Surah An-Nisa, Verse 93

وَمَن يَقۡتُلۡ مُؤۡمِنٗا مُّتَعَمِّدٗا فَجَزَآؤُهُۥ جَهَنَّمُ خَٰلِدٗا فِيهَا وَغَضِبَ ٱللَّهُ عَلَيۡهِ وَلَعَنَهُۥ وَأَعَدَّ لَهُۥ عَذَابًا عَظِيمٗا٩٣

waman yaqtul mu'minan mutaʿammidan fajazāuhu jahannamu khālidan fīhā waghaḍiba l-lahu ʿalayhi walaʿanahu wa-aʿadda lahu ʿadhāban ʿaẓīman

But whoever kills a believer intentionally - his recompense is Hell, wherein he will abide eternally, and Allāh has become angry with him and has cursed him and has prepared for him a great punishment.