(2) باب تَعْظِيمِ الدَّمِ
It was narrated from 'Abdullah bin Buraidah that his father said:
"The Messenger of Allah [SAW] said: 'Killing a believer is more grievous before Allah than the extinction of the whole world.'" (ID)
Reference (ID): Sunan an-Nasa'i 3990 (ID)
In-book reference (ID): Book 37, Hadith 25 (ID)
English translation (ID): Vol. 5, Book 37, Hadith 3995 (ID)