I heard the Prophet ﷺ saying, "Whoever sees me in a dream will see me in his wakefulness, and Satan cannot imitate me in shape." Abu ʿAbdullah said, "Ibn Seereen said, 'Only if he sees the Prophet ﷺ in his (real) shape.'"  

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ مَنْ رَآنِي فِي الْمَنَامِ فَسَيَرَانِي فِي الْيَقَظَةِ وَلاَ يَتَمَثَّلُ الشَّيْطَانُ بِي قَالَ أَبُو عَبْدِ اللَّهِ قَالَ ابْنُ سِيرِينَ إِذَا رَآهُ فِي صُورَتِهِ