When you come to a subject like tithing, I think it is important to see that there are two extremes to avoid. The first is the temptation to conclude that tithing is not for this age, so that I feel no obligation to give, and can keep as much money for myself as possible. The other is to use the tithing texts to make people feel obliged to give more, and to feel guilty if they don't.
Preachers are usually the guilty ones with respect to the latter.
Two of the remaining 3 occurrences occur in Luke. Thus, Jesus does not condemn tithing, but says that there are more important matters. So far as I can find in the New Testament, neither Jesus or any of His apostles taught the necessity of tithing. By and large, the Ten Commandments have been carried over into the New Testament. It is no longer our duty or obligation to stone disobedient children.