It was narrated that Mughirah bin Shu'bah said:
The Messenger of Allah (ﷺ) said: '"Whoever narrates a Hadith from me thinking it to be false, then he is one of the two liars." (RU)
English reference (RU): Vol. 1, Book 1, Hadith 41 (RU)
Arabic reference (RU): Book 1, Hadith 43 (RU)