The story is found in 1 Samuel 12.  In this incident, the prophet addresses “all Israel.”  Mostly, he calls them to repentance and urges them to live righteous lives.  But the prophet also lies in his address!  He criticizes the people for responding to a threat coming from the Ammonite king, Nahash.  According to Samuel, when this king threatened Israel, they asked for the prophet to anoint a king.  But that was not true.  It was when the people saw that Samuel was old and that his sons were corrupt, that they asked for a king.  In this speech, Samuel does not even mention his sons’ corruption.  Even a great prophet like Samuel has to be discerned when he speaks, since he does not always speak truthfully.