"The Messenger of Allah said: 'Whoever kills a Mu'ahad with no justification, Allah will forbid Paradise to him." (Using translation from Nasāʾī 4747)  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مَنْ قَتَلَ مُعَاهَدًا فِي غَيْرِ كُنْهِهِ حَرَّمَ اللَّهُ عَلَيْهِ الْجَنَّةَ»