Isaiah 39:5 - Albert Barnes' Notes on the Bible

Hear the word of the Lord of hosts - Hear what the mighty God that rules in heaven says of this. This is an instance of great fidelity on the part of the prophet. He felt himself sent from God in a solemn manner to rebuke sin in a monarch, and a pious monarch. It is an instance that strikingly resembles the boldness and faithfulness of Nathan when he went to David, and said, ‘Thou art the man’ 2 Samuel 12:7.