19:18-25 The words, In that day, do not always refer to the passage just before. At a time which was to come, the Egyptians shall speak the holy language, the Scripture language; not only understand it, but use it. Converting grace, by changing the heart, changes the language; for out of the abundance of the heart the mouth speaks. So many Jews shall come to Egypt, that they shall soon fill five cities. Where the sun was worshipped, a place infamous for idolatry, even there shall be a wonderful reformation. Christ, the great Altar, who sanctifies every gift, shall be owned, and the gospel sacrifices of prayer and praise shall be offered up. Let the broken-hearted and afflicted, whom the Lord has wounded, and thus taught to return to, and call upon him, take courage; for He will heal their souls, and turn their sorrowing supplications into joyful praises. The Gentile nations shall not only unite with each other in the gospel fold under Christ, the great Shepherd, but they shall all be united with the Jews. They shall be owned together by him; they shall all share in one and the same blessing. Meeting at the same throne of grace, and serving with each other in the same business of religion, should end all disputes, and unite the hearts of believers to each other in holy love.

20. it—the altar and pillar.

a sign—(of the fulfilment of prophecy) to their contemporaries.

a witness—to their descendants.

unto the Lord—no longer, to their idols, but to Jehovah.

for they shall cry—or, "a sign … that they cried, … and He sent to them a saviour"; probably, Alexander the Great (so "a great one"), whom the Egyptians welcomed as a deliverer (Greek, Soter, a title of the Ptolemies) out of the hands of the Persians, who under Cambyses had been their "oppressors." At Alexandria, called from him, the Old Testament was translated into Greek for the Greek-speaking Jews, who in large numbers dwelt in Egypt under the Ptolemies, his successors. Messiah is the antitype ultimately intended (compare Ac 2:10, "Egypt").