Hezekiah sent letters not only to the people of Judah but also to all the people of Israel in order to keep the oneness of all God’s elect (vv. 1, 6). He asked all the people of Israel and Judah to come to Jerusalem, where the house of God was, to hold the Passover in order to remind them to keep the one unique ground of the worship of God among all Israel (v. 1; cf. Deut. 12:5, 11, 13-14). Hezekiah realized that keeping the unique ground pleases the heart of God.