'Lord of Hosts' in the Bible

And this man went up from his city yearly to worship and to sacrifice to the LORD of hosts in Shiloh. And the two sons of Eli, Hophni and Phinehas, the priests of the LORD, were there.

And she vowed a vow, and said, O LORD of hosts, if thou wilt indeed look on the affliction of thy handmaid, and remember me, and not forget thy handmaid, but wilt give to thy handmaid a male child, then I will give him to the LORD all the days of his life, and there shall no razor come upon his head.

So the people sent to Shiloh, that they might bring from thence the ark of the covenant of the LORD of hosts, who dwelleth between the cherubim: and the two sons of Eli, Hophni and Phinehas, were there with the ark of the covenant of God.

Thus saith the LORD of hosts, I remember that which Amalek did to Israel, how he laid wait for him in the way, when he came up from Egypt.

Then said David to the Philistine, Thou comest to me with a sword, and with a spear, and with a shield: but I come to thee in the name of the LORD of hosts, the God of the armies of Israel, whom thou hast defied.