(2) باب تَعْظِيمِ الدَّمِ
It was narrated that 'Amr bin Shurahbil said:
"The Messenger of Allah [SAW] said: 'The first matter concerning which scores will be settled among the people on the Day of Resurrection will be bloodshed.'"
Reference: Sunan an-Nasa'i 3995
In-book reference: Book 37, Hadith 30
English translation: Vol. 5, Book 37, Hadith 4000