Sharik bin Shihab reported,

I had long wished to meet one of the companions of the Prophet ﷺ so I could ask him about the Khawarij. Then on a day of Eid I met Abu Barzah in the company of some of his associates, and I said to him, "Did you hear the Messenger of Allah ﷺ mention the Khawarij?"He replied, "Yes. I heard the Messenger of Allah ﷺ with my own ears, and I saw him with my own eyes. Some wealth was brought to the Messenger of Allah ﷺ, and he distributed it, giving to those on his right and those on his left, but giving nothing to those behind him. A man stood up from behind him and said, 'Muhammad, you have not been just in this distribution.' He was a black man with closely cropped hair, wearing two white garments.The Messenger of Allah ﷺ became intensely angry and said, 'By Allah, you will not find after me a man more just than I am.' Then he said, 'In the last days a people will emerge as though this man were one of them. They will recite the Quran, but it will not pass beyond their throats. They will pass through Islam just as an arrow passes through its target. Their distinguishing mark is the shaving of their heads. They will continue to emerge until the last of them comes out with the Messiah, the Dajjal. When you encounter them, kill them. They are the worst of creation and creatures.'"

عن شريك بن شهاب قال

كنت أتمنى أن ألقى رجلا من أصحاب النبي ﷺ، أسأله عن الخوارج، فلقيت أبا برزة في يوم عيد في نفر من أصحابه، فقلت له: هل سمعت رسول الله ﷺ يذكر الخوارج؟ فقال: نعم، سمعت رسول الله ﷺ بأذني، ورأيته بعيني، أتى رسول الله ﷺ بمال، فقسمه، فأعطى من عن يمينه ومن عن شماله، ولم يعط من وراءه شيئا، فقام رجل من ورائه، فقال: يا محمد، ما عدلت في القسمة، رجل أسود مطموم الشعر عليه ثوبان أبيضان- فغضب رسول الله ﷺ غضبا شديدا، وقال: والله لا تجدون بعدي رجلا هو أعدل مني، ثم قال: يخرج في آخر الزمان قوم كأن هذا منهم، يقرؤون القرآن، لا يجاوز تراقيهم، يمرقون من الإسلام كما يمرق السهم من الرمية، سيماهم التحليق، لا يزالون يخرجون حتى يخرج آخرهم مع المسيح الدجال، فإذا لقيتموهم فاقتلوهم هم شر الخلق والخليقة.