Jehovah is their strength. By way of explanation, he repeats what he had said before, that God had been his strength; namely, because he had blessed his armies. David had indeed employed the hand and labor of men, but to God alone he ascribes the victory. As he knew that whatever help he had obtained from men proceeded from God, and that his prosperous success flowed likewise from his gratuitous favor, he discerned his hand in these means, as palpably as if it had been stretched forth from heaven. And surely it is passing shameful, that human means, which are only the instruments of God's power, should obscure his glory; although there is no sin more common. It is a manner of speaking which has great weight, when, speaking of his soldiers, he uses only the pronoun their, as if he pointed to them with the finger. The second clause assigns the reason of the other. He declares that himself and his whole army were endued with victorious valor from heaven, because he fought under the standard of God. This is the meaning of the word anointed; for, had not God appointed him king, and freely adopted him, he would not have favored him any more than he did Saul. By this means, in extolling solely the power of God which advanced him to the kingdom, he attributes nothing to his own policy or power. In the meantime, we may learn, that when one is satisfied of the lawfulness of his calling, this doctrine encourages him to entertain good hope with respect to the prosperous issue of his affairs. In particular, it is to be observed, as we have briefly noticed in another place, that the fountain whence all the blessings God bestows upon us flows is, that he hath chosen us in Christ. David employs salvations or deliverances in the plural number, because he had been often and in various ways preserved. The meaning, therefore, is, that from the time when God had anointed him by the hand of Samuel, he never ceased to help him, but delivered him in innumerable ways, until he had accomplished the work of his grace in him.

The Lord is their strength - Margin, "his strength." The Hebrew is, "their strength," or "strength to them." The allusion is to the people of God. The course of thought seems to be, that the psalmist, having derived in his own case assistance from God, or having found God a strength to him, his mind turns from this fact to the general idea that God was the strength of "all" who were in similar circumstancaes; or that all His people might confide in Him as he had done.
And he is the saving strength - Margin, as in Hebrew, "strength of salvations." That is, In Him is found the strength which produces salvation. See the notes at Psalm 27:1.
Of his anointed - See Psalm 2:2, note; Psalm 20:6, note. The primary reference here is doubtless to the psalmist himself, as one who had been annointed or set apaart to the kingly office; but the connection shows that he intended to include all the people of God, as those whom He had consecrated or set apart to His service. See 1-Peter 2:5, 1-Peter 2:9.

The Lord is their strength - Instead of למו lamo, to them, eight MSS. of Kennicott and De Rossi have לעמו leammo to his people; and this reading is confirmed by the Septuagint, Syriac, Vulgate, Ethiopic, Arabic, and Anglo-Saxon. This makes the passage more precise and intelligible; and of the truth of the reading there can be no reasonable doubt. "The Lord is the strength of his People, and the saving strength of his anointed." Both king and people are protected, upheld, and saved by him.

The LORD [is] (g) their strength, and he [is] the saving strength of his anointed.
(g) Meaning his soldiers who were means by which God declared his power.

The Lord is their strength,.... The strength of his people, mentioned in Psalm 28:9; not only the strength of David in particular, but of all his people in general; see Psalm 37:39;
and he is the saving strength of his anointed; meaning either himself, as before, who was anointed by Samuel king of Israel, and therefore had not invaded and thrust himself into an office he had no call and right unto; or the Messiah, the Lord's Anointed, whom he heard, helped, and strengthened in the day of salvation, and delivered him from the power of death and the grave, and raised him from thence, and gave him glory; see Psalm 20:6.

The distinction made between the people.
their strength--and the anointed--may indicate Absalom's rebellion as the occasion.