18 In that day five cities in the land of Egypt will speak the language of Canaan and swear by the Lord of hosts; one will be called the City of Destruction. 19 In that day there will be an altar to the Lord in the midst of the land of Egypt, and a pillar to the Lord at its border. 20 And it will be for a sign and for a witness to the Lord of hosts in the land of Egypt; for they will cry to the Lord because of the oppressors, and He will send them a Savior and a Mighty One, and He will deliver them. 21 Then the Lord will be known to Egypt, and the Egyptians will know the Lord in that day, and will make sacrifice and offering; yes, they will make a vow to the Lord and perform it. 22 And the Lord will strike Egypt, He will strike and heal it; they will return to the Lord, and He will be entreated by them and heal them. 23 In that day there will be a highway from Egypt to Assyria, and the Assyrian will come into Egypt and the Egyptian into Assyria, and the Egyptians will serve with the Assyrians. 24 In that day Israel will be one of three with Egypt and Assyria--a blessing in the midst of the land, 25 whom the Lord of hosts shall bless, saying, "Blessed is Egypt My people, and Assyria the work of My hands, and Israel My inheritance."
Matthew Henry's Commentary on Isaiah 19:18-25
Commentary on Isaiah 19:18-25
(Read Isaiah 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.