In the beginning Cain and Abel tithed Abel of his livestock and Cain of the yield of the ground so tithing in that sense was being done from the beginning.
God says I AM the same yesterday and forever Malachi 3:6 "For I am the LORD, I do not change" The laws of God are still in effect today. God has not changed
God The Son Jesus says "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil."
Paul says in Romans 3:27-31
"Where, then, is boasting? It is excluded. On what principle? On that of observing the law? No, but on that of faith. For we maintain that a man is justified by faith apart from observing the law. Is God the God of Jews only? Is he not the God of Gentiles too? Yes, of Gentiles too, since there is only one God, who will justify the circumcised by faith and the uncircumcised through that same faith. Do we, then, nullify the law by this faith? Not at all! Rather, we uphold the law."
Malachi 3:8-9
“Will a man rob God? Yet you rob me. But you ask, ‘How do we rob you?’“In tithes and offerings. You are under a curse—the whole nation of you—because you are robbing me.
Malachi 3:13-15
“You have said harsh things against me,” says the Lord. “Yet you ask, ‘What have we said against you?’
“You have said, ‘It is futile to serve God. What did we gain by carrying out his requirements and going about like mourners before the Lord Almighty? But now we call the arrogant blessed. Certainly the evildoers prosper, and even those who challenge God escape.’”
If we do not tithe the work of God cannot be done fully such as sending missionaries overseas to evangelize.
If you break one commandment its like breaking all. How can you place one above the other?
Jesus says again "Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven." Matthew 5:19