And the Lord shall be King over all the earth,.... This refers to the spiritual reign of Christ in the latter day; upon the success of the Gospel everywhere, there will be great conversions in all places; Gospel churches will be set up and ordinances administered everywhere; the earth will be filled with the knowledge of the Lord; his kingdom will be from sea to sea, from the eastern to the western one, and his dominion will reach to the ends of the earth; Popish nations, Mahometan kingdoms, Pagan ones, and all the kings of the earth, will become Christian, and submit to the sceptre of Christ's kingdom:in that day shall there be one Lord; there is but one Lord in right now, and there is but one in fact that is owned by real Christians; and there will be but one in the spiritual reign, among all that are called Christians; there will be but one Lord and Head to Jews and Gentiles, Ho 1:11 the pope of Rome will be no more owned as head of the church, nor any other:and his name, one; this refers not to any particular name by which Christ shall be called; but rather to that by which his people shall be called; all names of distinction being now laid aside, and only that of Christians retained; though it chiefly designs unity of doctrine, uniformity of worship, one and the same way of administering ordinances: it signifies that there will be one true, spiritual, uniform worship and religion; there will be no different sentiments and principles in religion; nor different practices and modes of worship; nor different sects; but all agreeing in the same faith and practice, under one Lord and King, Christ Jesus.
So the Targum,"they shall serve before the Lord with one shoulder; for his name is firm in the world, and there is none besides it.''This passage is referred by the ancient Jews to the times of the Messiah.
Zohar in Deut. fol. 110.