Musannaf Ibn Abi Shaybah 40705 — Reports on the Khawarij

Sa'id bin Jumhan said: The Khawarij invited me to join their group, and I was close to joining them. Meanwhile, the sister of Abu Bilal saw Abu Bilal in a dream, covered in shaggy hair, and asked him: "O my brother, what has happened to you?" He said: "After you, we have been made the dogs of Hell."