'Lord of Hosts' in the Bible

And Elisha said, "As sure as the LORD of Hosts liveth - in whose sight I stand - and it were not that I regard the presence of Jehoshaphat the king of Judah, I would not look toward thee, nor yet see ye."

For out of Jerusalem shall go a remnant, and a number that shall escape out of mount Zion: the zeal of the LORD of Hosts shall bring this thing to pass.