Reference

Numbers 31:21

And Eleazar the priest said unto the men of war which went to the battle, This is the ordinance of the law which the Lord commanded Moses;
19

And do ye abide without the camp seven days: whosoever hath killed any person, and whosoever hath touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.

20

And purify all your raiment, and all that is made of skins, and all work of goats’ hair, and all things made of wood.

21

And Eleazar the priest said unto the men of war which went to the battle, This is the ordinance of the law which the Lord commanded Moses;

22

Only the gold, and the silver, the brass, the iron, the tin, and the lead,

23

Every thing that may abide the fire, ye shall make it go through the fire, and it shall be clean: nevertheless it shall be purified with the water of separation: and all that abideth not the fire ye shall make go through the water.

Counter-Arguments

The strongest case that this verse does not belong in this theme.

Christ as High Priest

This verse simply records Eleazar the priest stating an ordinance of the law given to Moses, without any mention of a future high priest, sacrifice, mediation, or connection to Christ or Melchizedek. The focus is entirely on the immediate legal instruction within the Levitical system.