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