مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3651
Musnad of Abdullah bin Mas'ood
It was narrated that Shaqeeq said: ‘Abdullah (رضي الله عنه) said: The Messenger of Allah (ﷺ) said: "The first matter that will be judged between people on the Day of Resurrection will be bloodshed."
Musnad Ahmad 3674Its isnad is saheeh, al-Bukhari (6533) and Muslitn (1678)]