It was narrated from Bara' bin Azib that the Messenger of Allah ﷺ said:
“If this world were to be destroyed, that would be less significant before Allah (Subhanahu-wa-Taala) than the unlawful killing of a believer.”

حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا مَرْوَانُ بْنُ جَنَاحٍ، عَنْ أَبِي الْجَهْمِ الْجُوزَجَانِيِّ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ، أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " لَزَوَالُ الدُّنْيَا أَهْوَنُ عَلَى اللَّهِ مِنْ قَتْلِ مُؤْمِنٍ بِغَيْرِ حَقٍّ " .