Musannaf Ibn Abi Shayba 37:457

Jarir narrated to us, from Abd al-Aziz ibn Rufay’, from Ubayd ibn Umayr al-Laythi, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "The Hour will not be established until thirty liars emerge, all of them claiming to be a prophet, before the Day of Resurrection."