Hebrews 7:5

An Understandable Version (2005 edition)

For indeed, the descendants of Levi, who are appointed to the priesthood, are commanded by the Law of Moses to collect a tenth [of the income] of the Israelites, who are their brothers, even though these brothers are [also] descendants of Abraham.

Cross References

Hebrews 5:4

And no one takes on himself the honor [of head priest], but [he is appointed only] when he is called by God, as was the case with Aaron.

Hebrews 7:10

for when Melchizedek met him, he was still in Abraham’s body [i.e., Levi had not yet been born as a descendant of Abraham].