Narrated Abu Qatada:
The Prophet ﷺ said, "A good dream is from Allah, and a bad or evil dream is from Satan;
so if anyone of you has a bad dream of which he gets afraid, he should spit on his left side and should seek Refuge with Allah from its evil, for then it will not harm him."
• Sahih al-Bukhari, Vol. 4, Book of Beginning of Creation, Hadith 513
• Sahih al-Bukhari, Book of Beginning of Creation, Hadith 513