Charles Ellicott Commentary 2 Kings 19:1

"And it came to pass, when king Hezekiah heard it, that he rent his clothes, and covered himself with sackcloth, and went into the house of Jehovah." — 2 Kings 19:1 (ASV)

Went into the house of the Lord. —To humble himself before Jehovah and pray for help (Compare to 2 Chronicles 32:20).