Psalms 18:47-50

It is God that avengeth me That executeth vengeance, both by me, against his malicious enemies, and for me, against Saul, on whom I would not avenge myself. Thou liftest me up above those, &c. Above their malice and power. Thou hast delivered me from the violent man From Saul, whose name, for honour's sake, he forbears to mention. Therefore I will give thanks to thee among the heathen In the great congregations, consisting of the Israelites of all the tribes, of whom the word גוים, goim, nations, here rendered heathen, is used, Joshua 3:17; Joshua 4:1; Ezekiel 2:3, and elsewhere. Or, he means that he would give thanks to Jehovah, in the presence of those Gentiles who resorted to Jerusalem in great numbers, and before others of them who were either subject to him, or confederate with him, as he should have occasion of speaking or writing to any of them. It is probable, however, that David was here transported beyond himself, and spoke this with a special reference to Christ, who was to be his seed, of whom he was an eminent type, and by whom, what he here mentions, was most eminently done. Accordingly these words are applied to him, and to his calling of the Gentiles, Romans 15:9. Great deliverance giveth he to his king The king whom he himself hath chosen and constituted. Literally the words, מגדל ישׁעוה mean, He magnifies the salvations of his king, which are said to be magnified, because “they are great and wonderful in themselves, and because they add a dignity and lustre to the king on whom they are bestowed; there being nothing that can tend more to advance the honour, and heighten the reverence, due to a prince than his being highly distinguished by the divine protection and care, and delivered thereby out of numerous dangers which threatened his prosperity and life.”

Chandler. And showeth mercy to his anointed, to David and his seed To all his posterity, and especially to the Messiah, in whom only the words, for evermore, are properly accomplished, it being only true of his kingdom, that it shall have no end.