I was just reviewing some of the things I had written to Jim Cannon at Chesapeake Community (now Sovereign Grace Church) a few years ago, and I rediscovered this nugget:

Hebrews 7:5 states, “And those descendants of Levi who receive the priestly office have a commandment in the law to take tithes from the people, that is, from their brothers.”

It is described (to Hebrew believers, no less) as a foreign practice: they have a commandment — not us; they take it (present-tense) — as of the writing of this epistle, the tithe was still being collected by Levites.