Albert Barnes Commentary 2 Kings 20:5

"Turn back, and say to Hezekiah the prince of my people, Thus saith Jehovah, the God of David thy father, I have heard thy prayer, I have seen thy tears: behold, I will heal thee; on the third day thou shalt go up unto the house of Jehovah." — 2 Kings 20:5 (ASV)

The captain of my people - This phrase, which does not occur elsewhere in Kings, is remarkable. It speaks to the authenticity of this full report of the prophet’s actual words, which are abbreviated in other places . The title, “Captain (nāgîd) of God’s people,” commonly used for David, is applied to Hezekiah as David’s true follower (2 Kings 18:3).