II Chronicles 30:1-5

And Hezekiah sent to all Israel and Judah, and also wrote letters to Ephraim and Manasseh, that they should come to the house of the LORD at Jerusalem, to keep the Passover to the LORD God of Israel. For the king and his leaders and all the assembly in Jerusalem had agreed to keep the Passover in the second month. For they could not keep it at the regular time, because a sufficient number of priests had not consecrated themselves, nor had the people gathered together at Jerusalem. And the matter pleased the king and all the assembly. So they resolved to make a proclamation throughout all Israel, from Beersheba to Dan, that they should come to keep the Passover to the LORD God of Israel at Jerusalem, since they had not done it for a long time in the prescribed manner.