Musannaf Ibn Abi Shayba 38:13

Ghundar narrated to us, from Shu'bah, from 'Amr ibn Murrah, who said: I heard Suwayd ibn al-Harith say: "I saw us on the Day of the Camel, and our spears and their spears were intertwined. If the men had willed, they could have walked upon them. They were saying 'Allahu Akbar' (God is the Greatest), and they were saying 'Subhan Allah' (Glory be to God), 'Allahu Akbar'. And they were saying, 'There is no doubt in it,' and 'I wish I had not witnessed it.'" And 'Abdullah ibn Salamah says: "But it did not please me that I did not witness it, and I wished that every scene that 'Ali witnessed, I had witnessed."