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

It was narrated from Bara' bin Azib that the Messenger of Allah (PBUH) said: “If this world were to be destroyed, that would be less significant before Allah (SWT) than the unlawful killing of a believer.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 21 Hadith 2619
Web Ref:  Sunan Ibn Majah Vol 3 Book 21 Hadith 2619