John Calvin's Commentary on the Bible - Hebrews 7:5
Verse 5 5.And verily they, etc. It would be more suitable to render the words thus, “because they are the sons of Levi.” The Apostle indeed does not assign it as a reason that they received tithes because they were the sons of Levi; but he is comparing the whole tribe with Melchisedec in this way. Though God granted to the Levites the right of requiring tithes from the people, and thus set them above all the Israelites, yet they have all descended from the same parent; and Abraham, the father... read more
John Calvin's Commentary on the Bible - Hebrews 7:4
Verse 4 4.Now consider, etc. This is the fourth comparison between Christ and Melchisedec, that Abraham presented tithes to him. But though tithes were instituted for several reasons, yet the Apostle here refers only to what serves his present purpose. One reason why tithes were paid to the Levites was, because they were the children of Abraham, to whose seed the land was promised. It was, then, by a hereditary right that a portion of the land was allotted to them; for as they were not allowed... read more