Musnad Ahmad 907:86

Abdullah narrated to us, Khallad ibn Aslam Abu Bakr narrated to us, an-Nadr ibn Shumayl informed us, Shu'bah narrated to us, from Simak, who said: I heard Jabir ibn Samurah say: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "Before the Hour, there will be liars." Simak said: And my brother said to me that he said: "So beware of them."