Musnad Abu Ya'la al-Mawsili 109:263

Kamil narrated to us, Layth narrated to us, he said: Abu al-Zubayr narrated to me, from Jabir ibn Abdullah, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Whoever sees me in a dream has indeed seen me, for it is not appropriate for the devil to impersonate my form." And he said: "If one of you has a dream, let him not inform the people of the devil's playing with him in the dream."