Musnad Ahmad 547:1

Harun narrated to us, he said: Abdullah ibn Wahb narrated to us, from Amr ibn al-Harith, that Abu 'Ushaynah narrated to him that he heard Uqbah ibn Amir saying: I will not say today about the Messenger of Allah, may Allah bless him and grant him peace, what he did not say. I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "Whoever lies about me, saying what I did not say, let him occupy a house in Hell."