Without question, true godliness comes from this great mystery: Jesus came as a human being, and he was declared right with God by the Holy Spirit. He was seen by angels, preached among the nations, believed on in the world, and taken up in glory.
Melchizedek didn’t trace his family line from Levi, but he still collected a tenth from Abraham. Melchizedek blessed the one who had received the promises.
In the case of the Levites, the tenth is received by people who eventually die. But in the case of Melchizedek, it’s received by someone who’s said to be living.