'Lord of Hosts' in the Bible

This man went up from his city each year to worship and sacrifice to the Lord of hosts at Shiloh. Hophni and Phinehas, the two sons of Eli, were priests to the Lord there.

She made a vow, saying, “O Lord of hosts, if You will indeed look on the affliction (suffering) of Your maidservant and remember, and not forget Your maidservant, but will give Your maidservant a son, then I will give him to the Lord all the days of his life; a razor shall never touch his head.”

So the people sent word to Shiloh, and from there they carried 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 with the ark of the covenant of God.

Thus says the Lord of hosts (armies), ‘I will punish Amalek for what he did to Israel, how he set himself against him on the way when Israel came up from Egypt.

Then David said to the Philistine, “You come to me with a sword, a spear, and 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 taunted.