Ver. 1. And Hezekiah sent to all Israel and Judah
Sent2 Chronicles 30:2

For the king had taken counsel, and his princes, and all the
congregation in Jerusalem
He and his nobles, and the great sanhedrim or senate of the nation, had consulted together: to keep the passover in the second month;
in the month Ijar, as the Targum, because they could not keep it in the first month, as it should have been kept, according to the law of God, for the reasons following.