2 Chronicles 30:1-3

American Standard Version

30 And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of Jehovah at Jerusalem, to keep the passover unto Jehovah, the God of Israel. ² For the king had taken counsel, and his princes, and all the assembly in Jerusalem, to keep the passover in the second month. ³ For they could not keep it at that time, because the priests had not sanctified themselves in sufficient number, neither had the people gathered themselves together to Jerusalem.