the LORD God of hosts, the God of Israel = Jehovah Elohim Zeba'oth, Elohim of Israel. See App-4. This is the fullest (and therefore the most solemn) use of this Divine title. Occurs in this book only three times (here, Jer_38:17, and Jer_44:7).
Behold. Figure of speech Asterismos. App-6. Used to emphasize further what follows.