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