Musnad Ahmad 30:954

Abu Amir narrated to us, Aflah ibn Sa'id, a sheikh from the people of Quba among the Ansar, narrated to us, Abdullah ibn Rafi', the freed slave of Umm Salamah, narrated to us, he said: I heard Abu Hurairah saying: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "If a long time passes for you, it is imminent that you will see people who go out in the morning in the wrath of Allah, and return in the evening in His curse, in their hands being [things] like the tails of oxen."