Albert Barnes Commentary 2 Chronicles 30:1

"And Hezekiah sent to all Israel and Judah, and wrote letters also to Ephraim and Manasseh, that they should come to the house of Jehovah at Jerusalem, to keep the passover unto Jehovah, the God of Israel." — 2 Chronicles 30:1 (ASV)

Compare the note on 2 Chronicles 29:24.