Musnad Ahmad 759:0

The Hadith of Abu Layla, Abu Abd al-Rahman ibn Abi Layla: It was narrated to us by Muhammad ibn Ja’far, who said: It was narrated to us by Shu’bah, from al-Hakam, from Abu Abd al-Rahman, from Ali, that the Prophet (peace be upon him) said: "Do not lie about me, for whoever lies about me will enter the Fire."