Isa 19:18 In that day shall five cities in the land of Egypt speak the language of Canaan, and swear to the LORD of hosts; one shall be called, The city of destruction.
Five cities; five is the number of grace. Grace and salvation had/will come to Egypt. The language of Canaan is Hebrew and there is a heavenly language for prayer, through the Holy Spirit.
Rom 8:26 Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered.
Rom 8:27 And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God.
Rom 8:28 And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
The City of Destruction, was probably the City of the Sun the ancient city of Heliopolis, the Greek form of the words "the City of the Sun."
Isa 19:19 In that day shall there be an altar to the LORD in the midst of the land of Egypt, and a pillar at the border thereof to the LORD.
The pillar, of course, is a reference to the pillar that Jacob erected after his vision of God at the city of Bethel. Thus the altar and the pillar are a sign of Egypt's conversion. They simply speak of a Gentile recognition of the God of Israel and the fact that Egyptians begin to worship that God.(Stedman)
Isa 19:20 And it shall be for a sign and for a witness unto the LORD of hosts in the land of Egypt: for they shall cry unto the LORD because of the oppressors, and he shall send them a saviour, and a great one, and he shall deliver them.
They will receive Jesus who sets the captives free.
2 Sam 22:2 And he said, The LORD is my rock, and my fortress, and my deliverer;
2 Sam 22:3 The God of my rock; in him will I trust: he is my shield, and the horn of my salvation, my high tower, and my refuge, my saviour; thou savest me from violence.
2 Sam 22:4 I will call on the LORD, who is worthy to be praised: so shall I be saved from mine enemies.
2 Sam 22:5 When the waves of death compassed me, the floods of ungodly men made me afraid;
2 Sam 22:6 The sorrows of hell compassed me about; the snares of death prevented me;
2 Sam 22:7 In my distress I called upon the LORD, and cried to my God: and he did hear my voice out of his temple, and my cry did enter into his ears.
He will do the same for you and I.
Isa 19:21 And the LORD shall be known to Egypt, and the Egyptians shall know the LORD in that day, and shall do sacrifice and oblation; yea, they shall vow a vow unto the LORD, and perform it.
Isa 19:22 And the LORD shall smite Egypt: he shall smite and heal it: and they shall return even to the LORD, and he shall be entreated of them, and shall heal them.
The LORD will smite Egypt and heal it. They shall receive the Lord.
Heb 13:15 By him therefore let us offer the sacrifice of praise to God continually, that is, the fruit of our lips giving thanks to his name and taking the Lord's supper.
Heb 12:6 For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
Heb 12:7 If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
Acts 10:34 Then Peter opened his mouth, and said, Of a truth I perceive that God is no respecter of persons:
Acts 10:35 But in every nation he that feareth him, and worketh righteousness, is accepted with him.