And let Zadok the priest, and Nathan the prophet, anoint him
there king over Israel
For it might be done by either of them, as the unctions of Saul and David show:
and blow ye the trumpet, and say, God save King Solomon;
the blowing of the trumpet was to make it public; the proclamation of him as king was to be made by the sound of it, and the acclamation of the people was to express their concurrence with it, their loyal affection to the new king, and their hearty wishes for his health, prosperity, and long life.