Wow. You are all over the road today. And wrong on every point.
And - in case you didn’t know - the topic is tithing not marriage or the 10 commandments.
Try to keep up, mmm-kay?
Sorry, you obviously need a sarc tag. Topic IS tithing, yet you made it Old vs New Testament with your post.
You seemed, by your initial post, to be willing to disregard the OT as no longer applying. So, If tithing does not apply (acccording to you) because it is only Specifically called for in the Old Testament, then maybe you also feel all that other OT stuff needn’t apply too.
While it WAS a commandment, one was also told to GIVE with a cheerful heart.
Seriously, you have Nothing but that God has allowed it to you. Giving, GIVING of your firstfruits, tithing, is as much New as old Testament.