'Lord of Hosts' in the Bible

So David waxed greater and greater: for the LORD of hosts was with him.

Now therefore thus shalt thou say unto my servant David, Thus saith the LORD of hosts, I took thee from the sheepcote, even from following the sheep, that thou shouldest be ruler over my people Israel:

Let it even be established, that thy name may be magnified for ever, saying, The LORD of hosts is the God of Israel, even a God to Israel: and let the house of David thy servant be established before thee.