2 Chronicles 30:18-20

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 is written. For Hezekiah had prayed for them, saying, The good Jehovah pardon every one that setteth his heart to seek God, Jehovah, the God of his fathers, though he be not cleansed according to the purification of the sanctuary. And Jehovah hearkened to Hezekiah, and healed the people.