It was narrated from 'Ali that:
The Prophet (ﷺ) said: '"Whoever narrates a Hadith from me thinking it to be false, then he is one of the two liars." (Either the one who invents a lie or the one who repeats it; both are liars). (IT)
English reference (IT): Vol. 1, Book 1, Hadith 38 (IT)
Arabic reference (IT): Book 1, Hadith 39 (IT)