(2) باب تَعْظِيمِ الدَّمِ
It was narrated that 'Abdullah bin 'Amr bin Al-'As said:
"The Messenger of Allah [SAW] said: 'By the One in Whose Hand is my soul, killing a believer is more grievous before Allah than the extinction of the whole world.'" (ID)
Reference (ID): Sunan an-Nasa'i 3986 (ID)
In-book reference (ID): Book 37, Hadith 21 (ID)
English translation (ID): Vol. 5, Book 37, Hadith 3991 (ID)