Musnad Ahmad 691:5

Marwan ibn Mu'awiyah narrated to us, Sufyan ibn Ziyad informed us, from Fatik ibn Fudalah, from Ayman ibn Khuraym, who said: The Messenger of Allah (peace and blessings of Allah be upon him) stood as a preacher and said: "O people, the testimony of falsehood has been made equal to associating partners with Allah, the Almighty and Majestic," (repeating it) three times. Then he said: "So avoid the impurity of idols and avoid false speech."