Contradiction with Matthew 7:13-14
Contradicts by suggesting the path to righteousness is narrow and few find it, while Isaiah 4:3 implies those who remain in Zion are automatically holy.
Matthew 7:13-14: Enter ye in at the strait gate: for wide [is] the gate, and broad [is] the way, that leadeth to destruction, and many there be which go in thereat: [strait: or, narrow]
Contradiction with Romans 3:23
Contradicts by stating all have sinned and fall short of the glory of God, while Isaiah 4:3 indicates those left in Zion will be called holy.
Romans 3:23: For all have sinned, and come short of the glory of God;
Contradiction with 1 Corinthians 6:9-10
Contradicts by listing who will not inherit the kingdom of God, which implies not all who remain are holy, unlike Isaiah 4:3's assertion about Zion's remnant.
1 Corinthians 6:9-10: Know ye not that the unrighteous shall not inherit the kingdom of God? Be not deceived: neither fornicators, nor idolaters, nor adulterers, nor effeminate, nor abusers of themselves with mankind,
Contradiction with Revelation 21:27
Contradicts by stating nothing impure will enter the holy city, which implies a strict selection, whereas Isaiah 4:3 implies those remaining in Zion are automatically considered holy.
Revelation 21:27: And there shall in no wise enter into it any thing that defileth, neither [whatsoever] worketh abomination, or [maketh] a lie: but they which are written in the Lamb's book of life.
Contradiction with Jeremiah 17:9
Contradicts by declaring the heart is deceitful above all things and beyond cure, conflicting with the notion in Isaiah 4:3 that those in Zion are automatically considered holy.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?