Musnad Ahmad 30:1174

Abu Amir narrated to us, Aflah bin Sa'id al-Ansari, from the people of Quba, narrated to us, Abdullah bin Rafi', the freed slave of Umm Salamah, said: I heard Abu Hurairah saying: I heard the Prophet, peace and blessings of Allah be upon him, saying: "If a period of time lasts for you, you are about to see people who go out in the morning in the wrath of Allah, and return in the evening in His curse, in their hands [is something] like the tails of oxen."