The Prophet (ﷺ) said, "Whoever has seen me in a dream, then no doubt, he has seen me, for Satan cannot imitate my shape.
Sahih al-Bukhari Book 91, Hadith 13
← Previous Hadith 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 `Abdullah said, "Ibn Seereen said, 'Only if he sees the Prophet (ﷺ) in his (real) shape.'"

Sahih al-Bukhari Book 91, Hadith 12 Next Hadith → The Prophet (ﷺ) said, "A good dream is from Allah, and a bad dream is from Satan. So whoever has seen (in a dream) something he dislikes, then he should spit without saliva, thrice on his left and seek refuge with Allah from Satan, for it will not harm him, and Satan cannot appear in my shape."

Sahih al-Bukhari Book 91, Hadith 14