Abu Ghalib narrates: I was in Syria, and Sayyiduna Abu Umamah Sudayy bin Ajlan (may Allah be pleased with him), the Companion of the Messenger of Allah (peace and blessings be upon him), was also there, and he was my friend. Then the heads of the Khawarij were brought, and he narrated a hadith similar to this from the Prophet (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 8019