At the beginning, there was only one nation. God sent to this nation, the prophets (messengers) to give them the good news (about the meaning of their lives as well as the continuation of their lives in Hereafter.) God also sent them the book to be used in the settlement of their disputes. However, whenever a new prophet came with undeniable miracles, the jealous ones did not follow him (thus mankind divided himself into different nations.) God (of course) guided the righteous ones (who belong to the nation of submitters;) God will guide whoever He wishes to the right path.