Musnad Ahmad 308:9

Abdullah ibn Ahmad said: I found in my father’s book, in his own handwriting: Ali ibn Abdullah narrated to us—and the greatest of my knowledge is that my father narrated to us from him—he said: Yazid ibn Zuray’ narrated to us, he said: Abd al-Rahman ibn Ishaq narrated to us, he said: Al-Zuhri narrated to us, from Ata’ ibn Yazid al-Laythi, from Abu Shurayh al-Khuza’i, that the Messenger of Allah, peace and blessings of Allah be upon him, said: "Among the most insolent of people toward Allah, the Almighty and Majestic, is one who kills someone other than his killer, or one who seeks blood-vengeance of the Pre-Islamic Era (Jahiliyyah) from the people of Islam, or one who claims to have seen in his sleep what he did not see."