سورة Al-Baqarah ( The Cow ) - الآية 213

Mankind was once a single community, [but then people developed differences], so God sent prophets to them as bearers of good tidings and warning, and sent down with them the Book containing the truth, so that He might judge between their disputes. It was only those to whom it [the scripture] was given who disagreed about it after clear signs had come to them, because of rivalry between them. God by His will guided the believers to the truth about which the others had disputed. God guides whom He will to a straight path.