2 Chronicles 30:1-3

1Then Hezekiah sent word throughout all Israel and Judah, and he also wrote letters to Ephraim and Manasseh inviting them to come to the house of the LORD in Jerusalem to keep the Passover of the LORD, the God of Israel. 2For the king and his officials and the whole assembly in Jerusalem had decided to keep the Passover in the second month,1 3since they had been unable to keep it at the regular time, because not enough priests had consecrated themselves and the people had not been gathered in Jerusalem.