Hadith #2277 (Jami' al-Tirmidhi)
Book: Chapters On Dreams
Narrator(s): Abdur Rahman bin Abi Shumayla عبد الرحمن بن أبي شميلة, Marwan bin Mua'wiya al-Fazari مروان بن معاوية الفزاري

” The Messenger of Allah (s.a.w) said: ” The believer’s dreams are a portion of the forty portions of Prophet-hood. And it is (as if it is) on the leg of a bird, as long as it is not spoken of. But when it is spoken of it drops.” I think he said: ” And it should not be discussed except with an intelligent one or a beloved one.”

Source: https://parallelquran.com/hadith/jami-al-tirmidhi-2277/