'Lord of Hosts' in the Bible

And David arose and went with all those who were with him to Baale-judah [Kiriath-jearim], to bring up from there [to Jerusalem] the ark of God which is called by the Name—the very Name of the Lord of hosts, who dwells enthroned above the cherubim.

When David had finished offering the burnt offerings and peace offerings, he blessed the people in the name of the Lord of hosts (armies),

So now, say this to My servant David, ‘Thus says the Lord of hosts, “I took you from the pasture, from following the sheep, to be ruler over My people Israel.

so that Your Name may be magnified forever, saying, ‘The Lord of hosts (armies) is God over Israel;’ and may the house (royal dynasty) of Your servant David be established before You.

For You, O Lord of hosts, God of Israel, have revealed this to Your servant, saying, ‘I will build you a house (royal dynasty).’ For that reason Your servant has found courage to pray this prayer to You.