Charles Ellicott Commentary 2 Chronicles 6:29

"what prayer and supplication soever be made by any man, or by all thy people Israel, who shall know every man his own plague and his own sorrow, and shall spread forth his hands toward this house:" — 2 Chronicles 6:29 (ASV)

When. —Or if, as in the Septuagint; the Hebrew word is ‘asher. (See Note on 2 Chronicles 6:24.)

His own sore (plague) and his own grief. —Kings, the plague of his own heart. So Syriac and Arabic. The phrase of the Chronicler looks like a gloss on this.

In this house. —The margin is right.