Musannaf Ibn Abi Shayba 38:38

Yahya ibn Adam narrated to us, he said: Abu Darar Zayd ibn Asr al-Dabbi, the imam of the mosque of Banu Hilal, narrated to us, he said: Khalid ibn Mujahid ibn Hayyan al-Dabbi, from Banu Mabhul, narrated to us, from a cousin of his called Tamim ibn Dhuhl al-Dabbi, who said: I was on the day of the Camel holding the stirrup of Ali, striving alongside him, and I was seeing that we were in Paradise. He was examining the slain, and he passed by a man whose appearance pleased him while he was killed. He said: "Who knows this?" I said: "This is so-and-so al-Dabbi, and this is his son," until I counted seven fallen men killed around him. He said: Then Ali said: "I wish that there was not a single Dabbi on the earth except that he was under this old man."