Ibn `Umar reported Allah's Messenger (ﷺ) as saying:
The pious dreams are the seventieth part of Prophecy. (RU)
Reference (RU): Sahih Muslim 2265 a (RU)
In-book reference (RU): Book 42, Hadith 20 (RU)
USC-MSA web (English) reference(deprecated numbering scheme): Book 29, Hadith 5632 (RU)