2 Chronicles 30:1-3

21st Century King James 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 the Lord at Jerusalem to keep the Passover unto the Lord God of Israel.

² For the king had taken counsel with his princes and all the congregation 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 sufficiently, neither had the people gathered themselves together at Jerusalem.