Mishkat al-Masabih 4609
Abu Huraira reported God’s messenger as saying:
"He who sees me in a dream has seen me, for the devil does not appear in my form.” 

(Bukhari and Muslim.)
وَعَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم قَالَ: «من رَآنِي فِي الْمَنَامِ فَقَدْ رَآنِي فَإِنَّ الشَّيْطَانَ لَا يَتَمَثَّلُ فِي صُورَتِي»