The Prophet ﷺ said, "Whoever sees me in a dream has truly seen me, for Satan cannot take my form."
حدثنا يحيى وابن جعفر قالا حدثنا هشام عن محمد
عن النبي ﷺ قال من رآني في المنام فقد رآني إن الشيطان لا يتشبه بي
Its isnad is sahih. It has already been mentioned at 3559, and see also 9287.