Musannaf Ibn Abi Shayba 34:136

Abu Mu'awiyah narrated to us, from al-A'mash, from Shaqiq ibn Salamah, from 'Amr ibn Sharhabil, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The first thing that will be judged among the people on the Day of Resurrection is [regarding] the blood."