That’s incorrect. The most important requirement of the Law of Moses had always been loving God . When a Pharisee asked Jesus what the greatest commandment was, Jesus replied, “You shall love the Lord your God with all your heart, and with all your soul, and with all your mind” (Matt 22:36-37), which comes from Deut 6:5.
“If you love the Lord your God, by walking in his ways, and by keeping his commandments and his statutes and his ordinances, then you shall live and multiply” (Deut 30:16). In other words, you demonstrate your love of God by keeping his commandments.
Loving your neighbour is nothing new either. In fact, Jesus said the second-greatest commandment is “to love your neighbour as yourself (Matt 22:39), which comes from Lev 19:18.
It would be an insult to God to suggest he is so trivial as to impose “rules for rules sake”. In Deut 10:13, God says his laws are “for your good”.
Isaiah 48:18 says, “Oh, that you had heeded My commandments! Then your peace would have been like a river, And your righteousness like the waves of the sea.”
The higher law of love was there from the beginning - Jesus said “all the law (of Moses) and the prophets” are based on loving God and loving your neighbour (Matt 22:40).
… or it could be that those “law-enthusiasts” are simply doing what Scripture says believers must do in order to be saved.
For example,
Paul says “Do we then make void the law through faith? Certainly not! On the contrary, we uphold the law.” (Romans 3:31);
Jesus said, “If you love me, you will keep my commandments ” (John 14:15);;
Rev 12:17 and 14:12 describes the people of God as those who keep God’s commandments and have faith in Jesus;
1John 2:3-6 says “He who says ‘I know him’ but disobeys his commandments is a liar , and the truth is not in him ”;
in Gal 5 and 1Cor 6, Paul warns believers that their sins (ie, disobeying God’s commandments) can result in them *not inheriting the kingdom of God.
in Rev 2 and 3, Jesus judges believers according to their “ works”.
But the New Covenant is “transactional” – the very meaning of the word “covenant” is transactional - it is a mutual agreement, contract or guarantee, predicated on meeting certain agreed conditions.
James 2:24 says, “a man is justified by works and not by faith alone” (“works” = keeping the commandments of God). In other words, God’s promise of eternal life is conditional on faith and works – if the conditions are not met, the promise is rendered null and void
This is nothing new – the old covenant was conditional too:
Deut 11:22-25 says, “For if you will be careful to do all this all this commandment with I command you to do, loving the Lord your God, walking in his ways, and clinging to him … No man will be able stand against you”.
Jesus said, “If you love me, you will keep my commandments” (John 14:15). We demonstrate our love for God by keeping his laws, so faith, love and obedience are inseparable. In Rev 12:17 and 14:12, the God’s people are described as those who have faith in Jesus and keep God’s commandments.
Obedience (keeping God’s commandments is necessary in order to be justified: “a man is justified by works and not by faith alone” (James 2:24).