Charles Ellicott Commentary 2 Chronicles 21:14

"behold, Jehovah will smite with a great plague thy people, and thy children, and thy wives, and all thy substance;" — 2 Chronicles 21:14 (ASV)

Behold, with a great plague will the Lord smite thy people. — Literally, Behold, Jehovah is about to smite a great smiting in your people and in your sons. The immediate object of the verb is not expressed. (Compare to 2 Chronicles 21:18.)

It was Jehoram himself who was smitten in his people, and in his sons, and in his wives, and in all his goods, as 2 Chronicles 21:17 shows. The "smiting" — that is, a heaven-sent stroke or divine visitation — consisted in an invasion of Philistines and Arabs, who sacked Jerusalem and the royal palace.