Contradiction with Romans 10:4
Leviticus 22:31 emphasizes keeping God's commandments, whereas Romans 10:4 states that Christ is the end of the law for righteousness to everyone that believes.
Romans 10:4: For Christ [is] the end of the law for righteousness to every one that believeth.
Contradiction with Galatians 3:24-25
Leviticus 22:31 stresses observing God's commandments, but Galatians 3:24-25 explains that the law was a schoolmaster to bring us to Christ, and now that faith has come, we are no longer under a schoolmaster.
Galatians 3:24-25: Wherefore the law was our schoolmaster [to bring us] unto Christ, that we might be justified by faith.
Contradiction with Colossians 2:16-17
Leviticus 22:31 commands adherence to God's statutes, while Colossians 2:16-17 suggests that religious observances like dietary laws and holy days are a shadow of things to come, fulfilled in Christ.
Colossians 2:16-17: Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath [days]: [in meat...: or, for eating and drinking] [respect: or, part]
Contradiction with Hebrews 8:13
Leviticus 22:31 entails following God's commandments, yet Hebrews 8:13 states that by naming a new covenant, the old one is made obsolete.
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 Matthew 15:11
Leviticus 22:31 involves ritual observance, whereas Matthew 15:11 emphasizes that what goes into a person does not defile them, but what comes out of their mouth.
Matthew 15:11: Not that which goeth into the mouth defileth a man; but that which cometh out of the mouth, this defileth a man.
Contradiction with Acts 15:28-29
Leviticus 22:31 supports keeping divine commandments, however, Acts 15:28-29 presents a decision by the apostles that Gentiles need not follow most Jewish laws, only abstaining from certain things.
Acts 15:28-29: For it seemed good to the Holy Ghost, and to us, to lay upon you no greater burden than these necessary things;