Contradiction with Matthew 5:17
This verse states that Jesus did not come to abolish the law, which suggests the continued teaching and obeying of laws as in Exodus 18:20, thus not a direct contradiction.
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 Romans 10:4
This verse states that Christ is the end of the law for righteousness, which could be seen as contradicting the emphasis on teaching statutes and laws in Exodus 18:20.
Romans 10:4: For Christ [is] the end of the law for righteousness to every one that believeth.
Contradiction with Galatians 2:16
This verse emphasizes justification by faith and not by the law, contrasting with Exodus 18:20's focus on teaching and following the law.
Galatians 2:16: Knowing that a man is not justified by the works of the law, but by the faith of Jesus Christ, even we have believed in Jesus Christ, that we might be justified by the faith of Christ, and not by the works of the law: for by the works of the law shall no flesh be justified.
Contradiction with Hebrews 8:13
This verse speaks about a new covenant, making the first obsolete, which contradicts the focus on old laws as in Exodus 18:20.
Hebrews 8:13: In that he saith, A new [covenant], he hath made the first old. Now that which decayeth and waxeth old [is] ready to vanish away.
Contradiction with Colossians 2:14
This verse mentions the blotting out of ordinances, contrary to Exodus 18:20's instruction to teach them.
Colossians 2:14: Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;