For the king and his officials and the whole assembly in Jerusalem had decided to keep the Passover in the second month,

Numbers 9:10
"Tell the Israelites: 'When any one of you or your descendants is unclean because of a dead body, or is away on a journey, he may still observe the Passover to the LORD.

Numbers 9:11
Such people are to observe it at twilight on the fourteenth day of the second month. They are to eat the lamb, together with unleavened bread and bitter herbs;

2 Chronicles 30:1
Then 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.

2 Chronicles 30:13
In the second month, a very great assembly gathered in Jerusalem to celebrate the Feast of Unleavened Bread.

2 Chronicles 30:15
And on the fourteenth day of the second month they slaughtered the Passover lamb. The priests and Levites were ashamed, and they consecrated themselves and brought burnt offerings to the house of the LORD.

For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.