Sahih al-Bukhari 7045
Narrated Abu Sa`id Al-Khudri:
I heard Allah's Messenger (ﷺ) saying, "If anyone of you saw a dream which he liked, then that was from 
Allah, and he should thank Allah for it and tell it to others; but if he saw something else, i.e, a dream 
which he did not like, then that is from Satan and he should seek refuge with Allah from it and should 
not tell it to anybody for it will not harm him."
حَدَّثَنَا إِبْرَاهِيمُ بْنُ حَمْزَةَ، حَدَّثَنِي ابْنُ أَبِي حَازِمٍ، وَالدَّرَاوَرْدِيُّ، عَنْ يَزِيدَ، عَنْ عَبْدِ اللَّهِ بْنِ خَبَّابٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّهُ سَمِعَ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏
"‏ إِذَا رَأَى أَحَدُكُمُ الرُّؤْيَا يُحِبُّهَا، فَإِنَّهَا مِنَ اللَّهِ، فَلْيَحْمَدِ اللَّهَ عَلَيْهَا، وَلْيُحَدِّثْ بِهَا، وَإِذَا رَأَى غَيْرَ ذَلِكَ مِمَّا يَكْرَهُ، فَإِنَّمَا هِيَ مِنَ الشَّيْطَانِ، فَلْيَسْتَعِذْ مِنْ شَرِّهَا، وَلاَ يَذْكُرْهَا لأَحَدٍ، فَإِنَّهَا لَنْ تَضُرَّهُ ‏"‏