Reference: Sabaoth, Lord of
Fausets
Hebrew tsebaot (not Sabbath, an altogether different word), i.e. "of hosts", namely, of the heavenly powers (1Ki 22:19; Ps 103:21; 148:2; Ro 9:29; Jas 5:4, reminding the rich who think the poor have no advocate that the Lord of the whole hosts in heaven is their patron). Implying the boundless resources at His command for His people's good (Ps 59:5). The sabaoth included both the angelic and starry hosts. The latter were objects of the idolatry, hence called sabaism (2Ki 17:16). God is above even them (1Ch 16:26). The "groves" symbolized these starry hosts. In contrast, Jehovah is the Lord of them, therefore alone to be worshipped. The title does not occur in the Pentateuch, nor earlier than 1Sa 1:3, but in the singular Jos 5:14-15.
See Verses Found in Dictionary
And he said, No; but I have come as captain of the armies of the Lord. Then Joshua, falling down with his face to the earth in worship, said, What has my lord to say to his servant? And the captain of the Lord's army said to Joshua, Take off your shoes from your feet, for the place where you are is holy. And Joshua did so.
Now this man went up from his town every year to give worship and to make offerings to the Lord of armies in Shiloh. And the two sons of Eli, Hophni and Phinehas, the priests of the Lord, were there.
And he said, Give ear now to the word of the Lord: I saw the Lord seated on his seat of power, with all the army of heaven in their places round him at his right hand and at his left.
And turning their backs on all the orders which the Lord had given them, they made for themselves images of metal, and the image of Asherah, worshipping all the stars of heaven and becoming servants to Baal.
For all the gods of the nations are false gods; but the Lord made the heavens.
You, O Lord God of armies, are the God of Israel; come now and give punishment to the nations; have no mercy on any workers of deceit. (Selah.)
Give praise to the Lord, all you his armies; and you his servants who do his pleasure.
Give praise to him, all you his angels: give praise to him, all his armies.
And, as Isaiah had said before, If the Lord of armies had not given us a seed, we would have been like Sodom and Gomorrah.
See, the money which you falsely kept back from the workers cutting the grass in your field, is crying out against you; and the cries of those who took in your grain have come to the ears of the Lord of armies.