There are promises associated with tithing that God gave us in Malachi 3:10. I don’t think those promises died with the law.
The law was there as the way that Jews could be Holy and Righteous before God. Obviously no one can keep the law, so the law pointed the Jews to Christ, as it was intended to do. So tithing will not make you holy in the eyes of God. But his promises associated with this command are still in affect. Christ coming and redeeming us did not abolish the promises of the Old Testament. That is my belief and understanding of it. No different than “Honor your father and mother” in the Old Testament. There are promises associated with that one too.
