They were the descendants of the original exiles, and had never lived in Judah; nevertheless, in the view of the authors of the Biblical literature, they, and not those who had remained in the land, were "Israel".[19] Judah, now called Yehud, was a Persian province, and the returnees, with their Persian connections in Babylon, were in control of it. They represented also the descendants of the old "Yahweh-alone" movement, but the religion they instituted was significantly different from both monarchic Yahwism[20] and modern Judaism. These differences include new concepts of priesthood, a new focus on written law and thus on scripture, and a concern with preserving purity by prohibiting intermarriage outside the community of this new "Israel".[20]