Mat 23:1 Then spake Jesus to the multitude, and to his disciples,
Mat 23:2 Saying, The scribes and the Pharisees sit in Moses' seat:
Mat 23:3 All therefore whatsoever they bid you observe, that observe and do; but do not ye after their works: for they say, and do not.
We are not covenantally under Moses' seat; else, we would be under the Levitical priesthood. Jesus is priest forever after the order of Melchizedek. We are under the New Covenant, not the Old Covenant.
Jesus is not endorsing any "principle" of a tithe. He is "endorsing" the Levitical LAW of tithes, and the "mint, rue, and all other kinds of garden herbs" is an important phrase to keep your mind from getting clouded and thinking that there's really some kind of phantom idea in the Bible about a tithe on wages or monetary income. There simple is NO such thing!
We have to be diligent to study the Scriptures so we understand, based on context and progressive revelation what is Old Covenant and what is New Covenant. I would say that there was a "transition period" between the Old Covenant and the New Covenant from Jesus' earthly ministry until the destruction of the temple in A.D. 70.
First of all, studying the actual Mosaic law helps us to know what are eternal moral principles and what are ceremonial and judicial statutes that were intended to be types that were fulfilled in Christ.
It took awhile for the apostles even after the resurrection to understand what changed covenantally based upon the death and resurrection of Christ. God "had to" give Peter a vision three times for him to understand that the Gentiles were now not "unclean."
If you compare Matthew 23:1-3,23 with Hebrews 7:5,12,18-19 you will see that there is indeed a covenantal difference! Matthew 23 pertains to the Levitical priesthood. Hebrews 7 shows that the Melchizedek priesthood succeeded the Levitical priesthood.
The best way to answer your question is to read the tithe laws carefully:
Genesis 14; 28:10-22
Leviticus 27:30-34
Numbers 18
Deuteronomy 12; 14; 26:12-19
2 Chronicles 31
Nehemiah 10:38-39; 13:1-14
Understand exactly WHAT the tithes were, not your modern presuppositions about a religious "tax" on wages or monetary income. Understand the concept of Mosaic Law and the Levitical priesthood and what purpose those served.
Then study the book of Hebrews, especially chapter 7. It shows conclusively that the tithes were abolished.
We give freely, cheerfully, and abundantly to support the ministry of the church, but this has NOTHING to do with the tithes, and the tithes had nothing to do with earned income. Just because the instructions to the church in the New Covenant do not tell you
how much you must give as a hard-and-fast rule does not mean we have to feel lost. Just give what you can and how you feel the Spirit lead, and
especially look for needs that need to be met and strive to fulfill them.
If you need more than this, maybe I can recommend [cough] my book [cough] for 140,000 words that could possibly answer and question you may have.