كتاب آداب النوم
5
The Book of the Etiquette of Sleeping, Lying and Sitting etc
Abu Hurairah (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "He who sees me in his dream will see me in his wakefulness (or he (ﷺ) may have said it is as though he has seen me in a state of wakefulness), for Satan does not appear in my form."

[Al-Bukhari and Muslim ].

وعنه قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏ "‏من رآني في المنام فسيراني في اليقظة -أو كأنما رآني في اليقظة- لا يتمثل الشيطان بي‏"‏ .‏
Sunnah.com reference : Book 5, Hadith 27
Arabic/English book reference : Book 5, Hadith 840