Isaiah 19:20

(Verses 19-21.) In that day there will be an altar to the Lord in the midst of the land of Egypt, and a pillar near its border to the Lord. And it will be for a sign and for a testimony to the Lord of hosts in the land of Egypt. For they will cry to the Lord because of the oppressor, and He will send them a Savior and a Champion who will deliver them. And the Lord will make Himself known to Egypt, and the Egyptians will know the Lord in that day. They will worship with sacrifices and offerings, and they will make vows to the Lord and fulfill them. From this place to the end of Egypt, both the Jews and we understand it as a vision or prophecy of Christ's coming; but they have different expectations for the future, while we consider it as already fulfilled. However, consider the day for the time being: although Josephus claims that these things happened during the time of Onias, who fled to Egypt and built a temple, an altar, and attempted to fulfill the prophecy of Christ in vain. But it is called one altar, just as there is one faith, one baptism, and one Church. And the title, next to its boundary, undoubtedly signifies the Gospel and the writings of the Apostles. For just as the land of Judea is understood above, according to the tropological understanding, as fearsome, or solemn, or the old Testament: so the title in the boundaries of Egypt is shown to be the history of the Gospels. Finally, it joins: And it shall be a sign and a testimony, namely of the Lord's passion. Then those who have believed, while the Egyptians are coming together against the Egyptians, and a man is fighting against his own brother, and city is fighting against city: when the time of persecution comes, they will implore the mercy of the Lord, and immediately the Savior will come, that is, Jesus, for this is what it means in our language. […]

(Verse 20.) And the Egyptians will know the Lord on that day; and they will worship him with sacrifices and offerings, and they will make vows to the Lord and fulfill them. And the Lord will strike Egypt with a plague, and he will heal it; and they will return to the Lord, and he will be appeased by them, and he will heal them. After the Egyptians have come to know the Lord, they will worship him with spiritual sacrifices and offerings; and they will make vows to the Lord and fulfill them; and they will say with David: 'Sacrifice to God a contrite spirit' (Psalm 50:19); and: 'The lifting up of my hands is an evening sacrifice' (Psalm 140:2); when they believe in the Nazarene and themselves become Nazarenes, not drinking wine and strong drink (John 19); and the vinegar that was given to the Lord, and whatever is made from the Sodomite grape. And when they have fulfilled their vows with Abel, and God looks upon them, Cain, the older brother, that is, the people of Circumcision, will envy and shed Christian blood, which will cry out to the Lord (Gen. IV); and therefore he will go forth from the face of God, saying of the Savior: Crucify him, crucify him (Luke XXIII, 11); and: We have no king but Caesar (John XIX, 15). He offers and fulfills his vow to the Lord, who is holy in body and spirit. Zacchaeus also offered a vow and promised to give half of his possessions to the poor (Luke 19). The question arises, if the Savior and defender was sent to Egypt to deliver them from distress, how can it now be said, 'The Lord will strike Egypt with a plague?' But let us consider what follows: 'And he will heal it.' For whom the Lord loves, he chastises (Hebrews 12). […]

He was called "Christ" from the anointing. Then, that the same one was a human being Jeremiah shows, saying, "And he is man, and who has known him?" And Isaiah, "And the Lord shall send them a man, who shall save them, and judging them he will heal them."

That he was both God and man was declared before by the prophets. That he was God, Isaiah thus declares, "They shall fall down before you, they shall make supplication to you, since God is in you, and we knew it not, even the God of Israel. They shall be ashamed and confounded, all of them who oppose themselves to you, and shall go unto confusion." … Likewise that he was man … Isaiah also thus speaks, "and the Lord shall send them a man who shall save them, and with judgment shall he heal them."

(Verse 19-21) On that day there will be an altar of the Lord in the midst of the land of Egypt, and a pillar near its boundary to the Lord. And it will be a sign and a witness to the Lord of hosts in the land of Egypt. For they will cry to the Lord because of the oppressor, and he will send them a Savior and a defender to deliver them, and the Lord will be known by Egypt.