He who saw me in a dream in fact saw me, for the satan cannot assume my form.
Sahih Muslim Book 42, Hadith 28
← Previous Hadith He who saw me in sleep in fact saw me, for it is not possible for the satan to appear in my form; and he also said: When any one of you sees a hulm he should not inform anyone, for it is a sort of vain sport of devil in the state of sleep.

Sahih Muslim Book 42, Hadith 27 Next Hadith → There came to him (the Holy Prophet) a desert Arab and said: I saw in a dream that I had been beheaded and I had been following it (the severed head). Allah's Apostle (ﷺ) reprimanded him saying: Do not inform about the vain sporting of devil with you during the night.

Sahih Muslim Book 42, Hadith 29