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). (ID)
English reference (ID): Vol. 1, Book 1, Hadith 38 (ID)
Arabic reference (ID): Book 1, Hadith 39 (ID)