Christ set a sinless example for us to follow of how to walk in obedience to the Mosaic Law and we are told to follow Christ's example (1 Peter 2:21-22), that those who are in Christ are obligated to walk in the same way he walked (1 John 2:6), and to be imitators of Paul as he is an imitator of Christ (1 Corinthians 11:1). Christ lived in obedience to the Mosaic Law, so that is the way that we also live when he is living in us, yet most Christians think that it makes perfect sense to interpret the Bible as arguing against following Christ's example of obedience to God.
The Son is the image of the invisible God (Colossians 1:15) and the radiance of God's glory and the exact image of His nature (Hebrews 1:3), so God is holiness, righteousness, goodness, justice, mercy, faithfulness, love, joy, peace, patience, kindness, gentleness, self-control, and so forth, and if all of these invisible aspects of God's nature were in the form of a body that we can see, then that would be the Son, which he expressed through setting a perfect example for us to follow of how to walk in obedience to the Mosaic Law. So the goal of the Mosaic Law is to teach us how to testify about aspects of God's nature and the way to follow Christ is by also testifying about those aspects of His nature by following his example of obedience to the Mosaic Law. For example, by doing good works in obedience to the Mosaic Law we are testifying about God's goodness, which is why our good works bring glory to Him (Matthew 5:16), and by testifying about God's goodness, which are also expressing the belief that God is good, or in other words, we are believing in Him.
In Exodus 20:6, God wanted His people to love Him and obey His commandments, so obedience to God has always been about more than an outward performance and God has always disdained it when His people honored Him with their lips while their hearts were far from Him (Isaiah 29:13). In Matthew 23:23, Jesus said that tithing was something that they ought to be doing while not neglecting weightier matters of the Mosaic Law of justice, mercy, and faithfulness, so Jesus was calling the Pharisees to have a higher level of obedience to it in a manner that is in accordance with the weightier matters that are aspects of God's nature/fruits of the Spirit that it was given to teach us how to express.