'Lord of Hosts' in the Bible

This man went up out of his city from year to year to worship and to sacrifice to the LORD of hosts in Shiloh. The two sons of Eli, Hophni and Phinehas, priests of the LORD, were there.

She vowed a vow, and said, "LORD of hosts, if you will indeed look on the affliction of your handmaid, and remember me, and not forget your handmaid, but will give to your handmaid a boy, then I will give him to the LORD all the days of his life, and no razor shall come on his head."

So the people sent to Shiloh; and they brought from there the ark of the covenant of the LORD of hosts, who sits above the cherubim: and the two sons of Eli, Hophni and Phinehas, were there with the ark of the covenant of God.

Thus says the LORD of hosts, 'I have marked that which Amalek did to Israel, how he set himself against him in the way, when he came up out of Egypt.

Then David said to the Philistine, "You come to me with a sword, and with a spear, and with a javelin: but I come to you in the name of the LORD of hosts, the God of the armies of Israel, whom you have defied.