But the salvation of the righteous [is] of the Lord
Both their temporal, spiritual, and eternal salvation; particularly the latter, which is originally of the Lord, and springs from the thoughts, purposes, and resolutions of his heart: it is of him freely, of his rich grace and abundant mercy; and it is of him fully and completely; it is an entire salvation of soul and body; includes all blessings of grace and glory in it; it is to the uttermost, and from all sin, and every enemy; and it is of him only; there is no salvation in any other; and the glory of it is to be ascribed to him, even to Jehovah, Father, Son, and Spirit; for all the three divine Persons have a concern in it: the determination, contrivance, and settlement of it, is of Jehovah the Father; the impetration or effecting of it is of Jehovah the Son; and the application of it is of Jehovah the Spirit; (See Gill on Psalms 3:8);
[he is] their strength in the time of trouble;
by reason of the hidings of God's face, the temptations of Satan, the prevalence of corruptions, the weakness of grace, and the many afflictions that befall them from God and men; the Lord he is their strong hold and munition of rocks, whither they, betake themselves, and find help, protection, and safety; he puts underneath everlasting arms, bears them up, and upholds them with the right hand of his righteousness; and is the strength of their hearts, of their lives, and of their salvation.