Musnad Ahmad 30:2193

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Abu Husayn, who said: I heard Dhakwan, Abu Salih, narrating from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever sees me in a dream, then he has indeed seen me, for the Shaytan does not take my form" — Shu‘bah said: Or he said: "does not resemble me." "And whoever lies about me intentionally, let him take his seat in the Fire."