Hadith 842

Jabir (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, "When one of you sees a bad dream let him blow three times on his left, seek refuge in Allah from the Satan three times (i.e., by saying: A'udhu billahi minash-Shaitanir-Rajim) and change the side on which he was lying."

[Muslim].

- وعن جابر رضى الله عنه عن رسول الله صلى الله عليه وسلم قال‏:‏ ‏"‏إذا رأى أحدكم الرؤيا يكرهها، فليبصق عن يساره ثلاثاً، وليستعذ بالله من الشيطان ثلاثاً، وليتحول عن جنبه الذي كان عليه‏"‏ ((رَوَاهُ مُسلِمٌ)).

Reference: 1708360
In-book reference: Book 4, Hadith 842
Hadith 842 - The Book of the Etiquette of Sleeping, Lying and Sitting etc - Riyad as-Salihin - Sunnah.com