Aboo Qataadah al-Ansaaree (radiyallaahu `anhu) said: I heard the Messenger of Allaah (sallallaahu `alaihi wa sallam) saying upon this pulpit:
“O people! Beware of relating a lot of hadeeths about me! Whoever says anything about me must not say except the truth, for whoever ascribes to me what I have not said, let him occupy his seat in the fire of hell!”
An authentic hadeeth graded authentic by many scholars.