Musnad Ahmad 907:153

Yahya ibn Sa'id narrated to us, from Shu'bah, who said: Simak narrated to me. And Ibn Ja'far said: Shu'bah narrated to us, from Simak, who said: I heard Jabir ibn Samurah saying: The Messenger of Allah (ﷺ) said—Ibn Ja'far said: I heard the Messenger of Allah (ﷺ) saying: "Before the Hour, there will be liars." Yahya said in his narration: My brother said—and he was closer to me—: "So beware of them."