Riyad as-Salihin: The Book of the Etiquette of Sleeping, Lying and Sitting etc – Hadith No. 162 — Abu Qatadah (May Allah be pleased with him) reported: The Prophet (ﷺ) said, “A… (Hadith No. 162)

Abu Qatadah (May Allah be pleased with him) reported: The Prophet (ﷺ) said, "A good vision (dream) is from Allah and a bad dream is from the Satan. He who sees something in a dream that he dislikes, should blow thrice on his left, must seek Allah's Refuge from the evil of the Satan (i.e., by saying: A'udhu billahi minash-Shaitanir-Rajim). Then it will not harm him.".

Explanation:

Reference: Riyad as-Salihin, The Book of the Etiquette of Sleeping, Lying and Sitting etc, Hadith No. 162