Nehemiah 6:5

Overview - Nehemiah 6
Sanballat practises by craft, by rumours, and by hired prophecies, to terrify Nehemiah.
15 The work is finished, to the terror of the enemies.
17 Secret intelligence passes between the enemies and the nobles of Judah.
Treasury of Scripture Knowledge

Nehemiah 6:5  (King James Version)
Then sent Sanballat his servant unto me in like manner the fifth time with an open letter in his hand;

with an open letter
This was a gross insult to a person of Nehemiah's quality; as the letters sent to chiefs and governors in the East are always carefully folded up, put in silk bags, and then sealed.
2 Kings 18:26-28 ; 2 Corinthians 2:11 ; 11:13-15 Ephesians 6:11 ; 2 Thessalonians 2:10