I mentioned being born again because the post I responded to mentioned, but I didn't mention being indwelt by the Holy Spirit because the post I responded to didn't mention it. In Ezekiel 36:26-27, the Spirit has the role of leading us to obey the Mosaic Law. In Romans 8:4-7, those who walk in the Spirit are contrasted with those who have minds set on the flesh, who are enemies of God, who refuse to submit to His law. In Galatians 5:19-22, everything listed as works of the flesh that are against the Spirit are also against the Mosaic Law, while all of the fruits of the Spirit are aspects of God's nature that are in accordance with it. In Acts 5:32, the Spirit is given to those who obey God.
If God is gracious to us be teaching us to obey His law (Psalms 119:29) and by teaching us to do what is godly, righteous, and good, and for how to renounce doing what is ungodly (Titus 2:11-14), then those who reject that teaching are rejecting God's grace.
God sowed good seed.
We do not earn our salvation by obeying the Mosaic Law because it was never given for that purpose, but that doesn't mean that our salvation does not require obedience to it for the purposes for which it was given. Again, the Mosaic Law is how the Israelites knew how to do what is godly, righteous, and good, and how to renounce doing what is ungodly, and in Titus 2:11-14, that is what our salvation involves being trained by grace to do. In Matthew 7:21-23, Jesus said that he would tell those who are workers of lawlessness to depart from him because he never knew them, so God's law is His instructions for how to know Christ, and whether we know Christ is a salvation issue.
The Mosaic Covenant is often described as a marriage relationship between God and Israel, so Mosaic Law is God's instructions for how to experientially know Him. In Jeremiah 9:3 and 9:6, they did not experientially know God and refuse to know Him because in 9:13, they had forsaken the Mosaic Law, while in 9:24, those who experientially know God know that He delights in practicing steadfast love, justice, and righteousness in all of earth, so delighting in expressing those and other aspects of God's nature through our obedience to the Mosaic Law is the way to have a relationship with God. Again, in John 17:3, eternal life is experientially knowing God and Jesus, in John 14:7, knowing Christ is knowing the Father, and in Matthew 19:17, the way to enter eternal life is by obeying the commandments, so obedience to the commandments is the way to experientially know Christ. In 1 John 2:4, those who say that they know Christ, but don't obey his commands are liars and the truth is not in them, and in 1 John 3:4-6, sin is the transgression of God's law, and those who continue to practice sin have neither seen not know him.
However, Jews can still keep the law while missing the whole goal of the law is to know Christ, who is the exact expression of God's nature (Hebrews 1:3). In Romans 9:30-10:4, the Israelites had a zeal for God, but it was not based on knowledge, so they failed to attain righteousness because they pursued the law as though righteousness were by works in an effort to establish their own instead of pursuing the law as though righteousness were by faith, for Christ is the goal of the law for righteousness for everyone who has faith. In John 5:39-40, Jesus said that they searched the Scriptures because they think that in them they will find eternal life, and they testify about him, yet they refuse to come to him that they might have life. In Matthew 19:17, the way to enter eternal life is by obeying the commandments, so eternal life can be found in the Scriptures and the Pharisees were correct to search for it there, however, they needed to recognize that the goal of everything in Scripture is to testify about how to have a relationship with Christ and come to him for eternal life. In Philippians 3:8, Paul was in the same boat, where he had been keeping the law, but without having a focus on knowing Christ, so he had been missing the whole goal of the law and counted it all as rubbish.
2 Peter 3:18 But grow in the grace and knowledge of our Lord and Savior Jesus Christ. To him be the glory both now and to the day of eternity. Amen.
Grace and knowledge of Christ are things that people can grow in, but are not all at the same growth level.