Contradiction with Romans 6:14
This verse states that we are not under the law but under grace, whereas Galatians 3:23 mentions being "shut up unto the faith which should afterwards be revealed," implying a time under the law before faith came.
Romans 6:14: For sin shall not have dominion over you: for ye are not under the law, but under grace.
Contradiction with Matthew 5:17
Jesus states He did not come to destroy the law but to fulfill it, while Galatians 3:23 suggests a period of the law being a holding pattern until faith was revealed.
Matthew 5:17: Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
Contradiction with 1 Timothy 1:8
This verse says that the law is good if used lawfully, contrasting Galatians 3:23, which implies the law was a confinement until faith.
1 Timothy 1:8: But we know that the law [is] good, if a man use it lawfully;
Contradiction with Psalm 19:7
It describes the law as perfect and converting the soul, whereas Galatians 3:23 suggests a restriction by the law until faith arrived.
Psalm 19:7: The law of the LORD [is] perfect, converting the soul: the testimony of the LORD [is] sure, making wise the simple. [law: or, doctrine] [converting: or, restoring]