Abu Abbas

http://www.sunnahonline.com/ilm/seerah/0010.htm
http://realtruthaboutislam.wordpress.com/2011/03/02/the-great-debate-of-ibn-%E2%80%98abbas-with-the-khawarij/
http://www.theonlyquran.com/hadith/Sahih-Bukhari/?chapter=60&hadith=201