in other words, heb 7 is not a tithe teaching for the church, so why turn it into that, if the text was not originally a tithe teaching?
I think that the main point of the Hebrews seven passage is to teach that there is a better priesthood than the one which came through Aaron and the Levites. The better priest came out of the tribe of Judah , meaning the better priest is Jesus.
Now if you and I were to present that to some recent Jewish converts , would we include tithing as a part of our argument ? I must confess that if I had never read this passage , I would not have thought to do so.
Which brings me to your question. The tithing issue is one of the secondary points of the passage , in my opinion. But it is raised as an issue and is profitable for doctrine nonetheless.
As a secondary point though , it does not stand alone very well to build a doctrine upon for the New Testament church. Without some other basis , it is quite the jump in thinking to require tithing based upon the Hebrews 7 passage.
I don't think that Hebrews 7 settles the issue one way or the other. It does emphasize that tithing under the law is not appropriate for Christians , but we already knew that from other passages.
Since Hebrews 7 goes back to Abraham , then the whole discussion about the law and tithing is irrelevant. Just like the other passages where the law is skipped over and Abraham is used as a model of faith for the Gentiles.
What I feel more confident saying is this. Abraham is the model of faith. First principle is if we are going to tithe , we should tithe in faith and not under law. Second principle , if we are going to tithe , we tithe to Jesus. Abraham tithed to Melchizedek , the type of Christ.
I would say that Hebrews 7 gives us a model of how to tithe but does not require tithing.
Also.....
The potential exists within the Genesis passage to teach that Christians can tithe.
I think that you will agree that Melchizedek is a type of Christ. Melchizedek was both king and priest.
So in the passage , it was not just some random king that Abraham decided to pay taxes to. It was a spiritual act of worship in giving a tithe of the spoils to God.
The fact that the scripture highlights the story first by including it as scripture and then by using it as an example to teach the New Testament church makes it important.
The fact that Jacob vowed to tithe and that Israel tithed shows that tithing was not just a one time random event in the history of the world. there is something important there or it would not be recorded in scripture.