Hebrews 7:6 - Matthew Poole's English Annotations on the Holy Bible

The proof is here applied, showing Melchisedec to be greater, not than the Levitical priest only, but than Abraham himself. But he whose descent is not counted from them; he drew not his genealogy from any priests before him, but is greater than those priests, who by genealogy and succession were made such, and set above their brethern by God himself: he being independent, having no progenitor, priest, or successor, is greater than whom he decimateth. Received tithes of Abraham, and blessed him that had the promises; he decimated Abraham, the father of the Levitical priests, and by the Most High's order blessed him, by assuring him of his peace with God, grace continually from him, and multiplying temporal and spiritual blessings to him, according as God promised, Genesis 15:1, &c. And this he did to him, though Abraham was a patriarch, and privileged with promises above any other; yet though God were made over to him in all his fulness, the blessing given him of fatherhood to a numerous nation, even the visible church of God among Israel, as to all believing Gentiles, who had Canaan literally promised to his posterity, and even this Salem, among the rest, of which Melchisedec was king, and the heavenly Canaan to himself; and above all, the promised Messiah to descend from him, in whom himself and all nations were to be blessed; he, so great in promises, is tithed and blessed by a greater Melchisedec.