Musnad Abu Ya'la al-Mawsili 133:4

Ibrahim narrated to us, Hammad narrated to us, from Ali bin Zayd, from Anas bin Malik, who said: When al-Husayn was killed, his head was brought to Ubayd Allah bin Ziyad. He began to strike his front teeth with his staff and said, "He certainly had beautiful teeth." I said, "By Allah, I will certainly grieve you. I have seen the Messenger of Allah (peace be upon him) kissing the place where your staff is now on his mouth."