Knowingly Spreading Fabricated Ahaadith

وعن سمرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم: من حدث عني بحديث يرى أنه كذب فهو أحد الكاذبين. رواه مسلم  (الترغيب والترهيب 1/145)

Hadhrat Samurah (Radhiyallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “The one who relates a Hadith from me which he regards to be lies (a fabricated narration), then he will be regarded (by Allah Ta’ala) as one of the liars.” (i.e. just as the one who had fabricated the narration will be deserving of Jahannum, the one who narrates it knowing that it is not true will also be deserving of Jahannum.