one king - not Zerubbabel, who was not a king either in fact or name, and who ruled over but a few Jews, and that only for a few years; whereas the King here reigns for ever. Messiah is meant (Eze 34:23, Eze 34:24). The union of Judah and Israel under King Messiah symbolizes the union of Jews and Gentiles under Him, partly now, perfectly hereafter (Eze 37:24; Joh 10:16).