Musnad Ahmad 32:1157

Yazid and Abu Qatan narrated to us, they said: Shu'bah narrated to us, from Hammad, from Anas ibn Malik, who said: Abu al-Qasim (may Allah bless him and grant him peace) said: "Whoever lies about me intentionally, let him take his seat in the Fire." And Abu Qatan did not say: "intentionally."