Abdullah ibn Amr reported:

Abdullah ibn Amr reported: The Messenger of Allah, peace be upon him, said, “By the one in whose Hand is my soul, the killing of a believer is worse in the sight of Allah than the demise of the world.”

[Al-Bayhaqi, Shu’b al-Iman, Number 4942, Hasan]

عَنْ عَبْدِ اللَّهِ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَالَّذِي نَفْسِي بِيَدِهِ لَقَتْلُ مُؤْمِنٍ أَعْظَمُ عِنْدَ اللَّهِ مِنْ زَوَالِ الدُّنْيَا

4942 شعب الإيمان للبيهقي السادس والثلاثون من شعب الإيمان وهو