At one time all people were only one nation. God sent Prophets with glad news and warnings. He sent the Book with them for a genuine purpose to provide the people with the ruling about disputed matters among them. No one disputed this matter except those who had already received evidence before. Their dispute was only because of their own hostility. To deal with this dispute, God, through His will, sent guidance to the believers. God guides to the right path whomever He wants.