2 Chronicles 30:3

30:3 For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem.

2 Chronicles 30:15

30:15 Then they killed the passover on the fourteenth [day] of the second month: and the priests and the Levites were ashamed, and sanctified themselves, and brought in the burnt offerings into the house of the LORD.

2 Chronicles 30:18-19

30:18 For a multitude of the people, [even] many of Ephraim, and Manasseh, Issachar, and Zebulun, had not cleansed themselves, yet did they eat the passover otherwise than it was written. But Hezekiah prayed for them, saying, The good LORD pardon every one 30:19 [That] prepareth his heart to seek God, the LORD God of his fathers, though [he be] not [cleansed] according to the purification of the sanctuary.