(2) باب تَعْظِيمِ الدَّمِ
It was narrated that 'Abdullah bin 'Amr said:
"Killing a believer is more grievous before Allah than the extinction of the whole world."
Reference: Sunan an-Nasa'i 3988
In-book reference: Book 37, Hadith 23
English translation: Vol. 5, Book 37, Hadith 3993