Contradiction with Psalm 147:20
This verse describes God dealing with Israel alone, implying exclusivity, which contrasts with the vision of inclusivity in Isaiah 19:23.
Psalm 147:20: He hath not dealt so with any nation: and [as for his] judgments, they have not known them. Praise ye the LORD.
Contradiction with Matthew 10:5
Jesus instructs his disciples not to go into the way of the Gentiles, whereas Isaiah 19:23 speaks of a highway connecting nations.
Matthew 10:5: These twelve Jesus sent forth, and commanded them, saying, Go not into the way of the Gentiles, and into [any] city of the Samaritans enter ye not:
Contradiction with Deuteronomy 7:2
God commands Israelites to make no covenants with other nations, contradicting the unity shown in Isaiah 19:23.
Deuteronomy 7:2: And when the LORD thy God shall deliver them before thee; thou shalt smite them, [and] utterly destroy them; thou shalt make no covenant with them, nor shew mercy unto them:
Contradiction with 2 Kings 17:34
Describes nations having separate statutes and not following God's unified law, opposing the collaboration in Isaiah 19:23.
2 Kings 17:34: Unto this day they do after the former manners: they fear not the LORD, neither do they after their statutes, or after their ordinances, or after the law and commandment which the LORD commanded the children of Jacob, whom he named Israel;
Contradiction with Ezra 10:11
Calls for separation from neighboring peoples, rather than collaboration.
Ezra 10:11: Now therefore make confession unto the LORD God of your fathers, and do his pleasure: and separate yourselves from the people of the land, and from the strange wives.