Although Christ did bring an end to the curse of the law and did away with the ceremonial requirements involving sacrafices, dietary restrictions, holy days, and a host of other rules, He did not terminate the moral obligation of the law.
Though we are no longer in legal bondage to the law of Moses or justified through the works of the law, the gospel of grace has not done away with the responsibility to fulfill the righteous requirements(Romans 8:4) we have been called to as Christ followers.
This is an important, underlying consideration concerning the principle of tithing. It is not a dead, legalistic observance but rather an act of spiritual sacrifice that involves our heart and attitude towards God. It weighs upon our moral responsbility of spiritual stewarship, honesty, faithfulness, thankfulness, and heartfelt devotion. Tithing is an external act which should reflect the Godly virtues of our hearts toward Christ.
Christ did not do away with the principle of tithing. He actually placed His divine stamp of approval and authority upon it when He gave His inspired verbal endorsement. In the book of Matthew, Christ confirmed the tithe principle when He challenged the scribes and pharisees for their legalism and inconsistency.
Woe unto you, scribes and Pharisees, pretenders! for you pay tithe of your spices, yet you have omitted the weightier matters of the law
judgment, mercy, and faith: these you ought to have done, and not leave the other undone. - Matthew 23:23
Though Christ strongly challenged the pharisees' twisting of the tithe principle through their legalism, He was careful to qualify His challenge by stating that the principle should not be discarded or discontinued.