Contradiction with Ecclesiastes 1:9
Ecclesiastes 1:9 states that there is nothing new under the sun, contradicting Isaiah 43:19 which speaks of God doing a new thing.
Ecclesiastes 1:9: The thing that hath been, it [is that] which shall be; and that which is done [is] that which shall be done: and [there is] no new [thing] under the sun.
Contradiction with Matthew 24:35
Matthew 24:35 emphasizes permanence in God's words, while Isaiah 43:19 suggests a new action or change by God.
Matthew 24:35: Heaven and earth shall pass away, but my words shall not pass away.
Contradiction with Hebrews 13:8
Hebrews 13:8 emphasizes the unchanging nature of Jesus Christ, in contrast to the newness described in Isaiah 43:19.
Hebrews 13:8: Jesus Christ the same yesterday, and to day, and for ever.