He shall send from heaven, and save me,.... His angel, as the Targum adds; or his angels, as Kimchi; who are ministering spirits, sent forth by him, to encamp about his people, and guard them, as they did Jacob when in fear of Esau, Genesis 32:1; or to deliver them out of trouble, as Peter when in prison, Acts 12:7; or rather the sense may be, that David did not expect any help and deliverance in an human way, by means of men on earth; but he expected it from above, from heaven, from God above, and which he believed he should have; and he might have a further view to the mission of Christ from heaven to save him, and all the Lord's people; and which he may mention, both for his own comfort, and for the strengthening of the faith of others in that important article;
[from] the reproach of him that would swallow me up. Meaning Saul; see
Psalms 56:1. The Targum renders it,
"he hath reproached him that would swallow me up for ever;''
and to the same sense the Septuagint, Vulgate Latin, Ethiopic, Arabic, and Syriac versions; disappointed them, and filled them with reproach, shame, and confusion.
Selah; on this word, Psalms 3:2.
God shall send forth his mercy and his truth; shall manifest and display the glory of these his perfections, his mercy and grace, his truth and faithfulness, in his deliverance and salvation; and which are remarkably glorified in salvation by Christ Jesus; and who himself may be called "his grace and his truth" n, as the words may be rendered; he being the Word of his grace, and truth itself, and full of both; and by whom, when sent forth, grace and truth came, John 1:14; it may also intend a constant supply of grace, whereby God would show forth the truth of his promises to him.
n חסדו ואמתו "gratiam et veritatem suam", Cocceius, Gejerus, Michaelis.