Musannaf Ibn Abi Shaybah 40725 — Reports on the Khawarij

Zayd bin Wahb said: On the day of Nahrawan, Sayyiduna Ali (may Allah be pleased with him) encountered the Khawarij. The spears kept thrusting, and the Khawarij were killed. Sayyiduna Ali (may Allah be pleased with him) said: "Look for Dhu al-Thudayyah among them," but even after searching he was not found. Sayyiduna Ali (may Allah be pleased with him) said: "I have not lied, nor have I been lied to. Look for him." When they searched again, he was lying in a hollow in the ground with some of the slain on top of him. On his hand was something like the whiskers of a cat. On seeing this, Sayyiduna Ali (may Allah be pleased with him) and the people said "Allahu Akbar", and the people were delighted and Sayyiduna Ali (may Allah be pleased with him) was also delighted.