كتاب الرؤيا
42  
The Book of Dreams
(1)
Chapter: The Words Of The Prophet (SAW): "Whoever Sees Me In A Dream Has Indeed Seen Me."
(1)
باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم ‏"‏ مَنْ رَآنِي فِي الْمَنَامِ فَقَدْ رَآنِي ‏"‏ ‏‏
Sahih Muslim 2267 a

Abu Qatada reported Allah's Messenger (ﷺ) as saying:

He who saw me in dream in fact saw the truth (what is true).
وَقَالَ فَقَالَ أَبُو سَلَمَةَ قَالَ أَبُو قَتَادَةَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ مَنْ رَآنِي فَقَدْ رَأَى الْحَقَّ ‏"‏ ‏.‏
Reference : Sahih Muslim 2267a
In-book reference : Book 42, Hadith 25
USC-MSA web (English) reference : Book 29, Hadith 5637
  (deprecated numbering scheme)