To give knowledge of salvation to his people by the remission of their sins,
      (3.) He has fulfilled the covenant of royalty made with the most famous Old-Testament prince, that is, David. Glorious things had been said of his family, that on him, as a mighty one, help should be laid, that his horn should be exalted, and his seed perpetuated, Psalms 89:19; Psalms 89:20; Psalms 89:24; Psalms 89:29. But that family had been long in a manner cast off and abhorred,Psalms 89:38. Now here it is glorified in, that, according to the promise, the horn of David should again be made to bud; for, Psalms 132:17, he hath raised up a horn of salvation for us in the house of his servant David (Luke 1:69; Luke 1:69), there, where it was promised and expected to arise. David is called God's servant, not only as a good man, but as a king that ruled for God; and he was an instrument of the salvation of Israel, by being employed in the government of Israel; so Christ is the author of eternal redemption to those only that obey him. There is in Christ, and in him only, salvation for us, and it is a horn of salvation; for, [1.] It is an honourable salvation. It is raised up above all other salvations, none of which are to be compared with it: in it the glory both of the Redeemer and of the redeemed are advanced, and their horn exalted with honour. [2.] It is a plentiful salvation. It is a cornucopia--a horn of plenty, a salvation in which we are blessed with spiritual blessings, in heavenly things, abundantly. [3.] It is a powerful salvation: the strength of the beast is in his horn. He has raised up such a salvation as shall pull down our spiritual enemies, and protect us from them. In the chariots of this salvation the Redeemer shall go forth, and go on, conquering and to conquer.