وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ، أَنَّهُ قَالَ سَمِعْتُ أَبَا قَتَادَةَ بْنَ رِبْعِيٍّ، يَقُولُ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏"‏ الرُّؤْيَا الصَّالِحَةُ مِنَ اللَّهِ وَالْحُلْمُ مِنَ الشَّيْطَانِ فَإِذَا رَأَى أَحَدُكُمُ الشَّىْءَ يَكْرَهُهُ فَلْيَنْفُثْ عَنْ يَسَارِهِ ثَلاَثَ مَرَّاتٍ إِذَا اسْتَيْقَظَ وَلْيَتَعَوَّذْ بِاللَّهِ مِنْ شَرِّهَا فَإِنَّهَا لَنْ تَضُرَّهُ إِنْ شَاءَ اللَّهُ ‏"‏ ‏.‏ قَالَ أَبُو سَلَمَةَ إِنْ كُنْتُ لأَرَى الرُّؤْيَا هِيَ أَثْقَلُ عَلَىَّ مِنَ الْجَبَلِ فَلَمَّا سَمِعْتُ هَذَا الْحَدِيثَ فَمَا كُنْتُ أُبَالِيهَا ‏.‏

Yahya related to me from Malik from Yahya ibn Said that AbuSalama ibn Abd ar-Rahman said, "I heard Abu Qatada ibn Ribiyy say thathe heard the Messenger of Allah, may Allah bless him and grant himpeace, say, 'The good dream is from Allah, and the bad dream is fromshaytan. When you see what you dislike, spit to your left side threetimes when you wake up, and seek refuge with Allah from its evil. Itwill not harm you then, Allah willing.' " Abu Salama said, "I wouldsee dreams which weighed on me more heavily than a mountain. When Iheard this hadith, I was not concerned about it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 52 Hadith 1754
Web Ref:  Muwatta Imam Malik Book 52 Hadith 4