And Isaiah said unto them, Thus shall ye say unto your master, Thus saith the LORD, Be not afraid of the words that thou hast heard, wherewith the servants of the king of Assyria have blasphemed me. Thus shall ye say - כה תאמרון ko tomerun, "thus shall ye (explicitly, earnestly, and positively) say. "The paragogic nun deepens and increases the sense.
Related Commentaries of Isaiah 37:6
Isaiah 37:6
6 And Isaiah said unto them, Thus shall ye say unto your master, Thus saith the LORD, Be not afraid of the words that thou hast heard, wherewith the servants of the king of Assyria have blasphemed me.