Hebrews 7:5
“And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:”
Without father, without mother, without descent, having neither beginning of days, nor end of life; but made like unto the Son of God; abideth a priest continually.
Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:
But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.
And without all contradiction the less is blessed of the better.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And all the tithe of the land, whether of the seed of the land, or of the fruit of the tree, is the Lord’s: it is holy unto the Lord.”
“And, behold, I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve, even the service of the tabernacle of the congregation.”
“When thou hast made an end of tithing all the tithes of thine increase the third year, which is the year of tithing, and hast given it unto the Levite, the stranger, the fatherless, and the widow, that they may eat within thy gates, and be filled;”
“And he led them out as far as to Bethany, and he lifted up his hands, and blessed them.”
“And thou shalt write Aaron’s name upon the rod of Levi: for one rod shall be for the head of the house of their fathers.”