Rab-shakeh said. See the references to this in Hezekiah's "Songs of the degrees". Psalms 120:2; Psalms 120:3; Psalms 128:3; Psalms 128:4, and compare Isaiah 37:4. See App-67.
What confidence... ? Note the Figure of speech Erotesis (App-6), which the Rab-shakeh constantly uses. See verses: 2 Kings 18:18; 2 Kings 18:20. 2Ki 20:22, 2Ki 20:24, 2Ki 20:25, 2Ki 20:27, 2Ki 20:33, 2Ki 20:34, 2Ki 20:35. Figure used for emphasis.