´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."
Hadith Referenceسنن ابن ماجه / كتاب السنة / 41
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم
In these narrations, the punishment for fabricating lies against the Messenger of Allah (sallallahu alayhi wa sallam) is mentioned, and in reality, lying against the Messenger of Allah (sallallahu alayhi wa sallam) is worse than all other lies in the world.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 41