Musnad Ahmad 333:0

Narrated Salama ibn al-Akwa’: The Messenger of Allah (ﷺ) said: "Whoever attributes to me what I have not said, let him take his seat in the Fire." Salama said: I heard the Messenger of Allah (ﷺ) say: "Whoever claims that I have said what I did not say, let him take his seat in the Fire."