This is the third part of a series of articles titled "Abdullah Ibn Abbas (RA)". It focuses on a historical debate between Ibn Abbas (RA) and the Khawarij, a group who opposed the leadership of Ali (RA). The article provides background on the conflicts that led to the emergence of the Khawarij, highlighting their strict interpretation of the Quran. It then details Ibn Abbas's arguments against their views, successfully persuading some to return to Ali's side, while others remained intransigent, eventually leading to conflict.