In The Name of Allaah, The Most Merciful, The Bestower of Mercy.
Shaikh Saaleh Al-Fawzaan [hafidhahullaah] said:
It is not permissible to transmit false and fabricated ahaadeeth, and then attribute them to the Messenger [sallal-laahu-alayhi-wasallam]. That is because many amongst the people of misguidance and the people of desires fabricate narrations, utilise them as proof and declare them authentic when [such narrations] agree with their desires. As for when the authentic narrations oppose their desires, either they belie them or distort and explain them [in a manner other than what is intended by] their correct meanings. This is the state of affairs of Ahlud-Dalaal [the people misguidance] – they search for fabricated and false ahaadeeth and present them to the people and utilise them as proof if it agrees with their desires. As for the authentic narrations that oppose their desires, they either belie them or change them from their right places [i.e. give them a distorted interpretation]. This is the affair of Ahlud -Dalaal [the people of misguidance]. Likewise among the characteristics of a hypocrite is that he lies when he speaks; so do not speak to the people unless you are truthful [in what you say], and do not speak too much regarding the ahaadeeth in that which there is no benefit [i.e. do not narrate just for the sake of narrating] out of fear of falling into lies. The Messenger [sallal-laahu-alayhi-wasallam] said, “It is enough lying for a man to speak of everything that he hears”. [Ref 1]
[An Excerpt from ‘It’haaf At-Tullaab Bi-Sharhi Mandhoomah Al-Aadaab’ page 103’. Slightly paraphrased]
Ref 1: Hadeeth declared Saheeh by Imaam Albaani in his checking of Abu Dawud’ Number 4992. Page 747-748. Publisher: Maktabah Al-Ma’aarif’ 1st edition]