See how great the privilege of the priesthood is. It has the right to take a tithe even from brothers, although they are of the same race and have one and the same ancestor.
Indeed, the priests from the sons of Levi have a commandment to take tithes from the people according to the law, although the people are of one race with them (Num 18:21).
But Melchizedek, although he did not come from their race and was not counted among their race, received a tithe from their ancestor Abraham. He did so as one who surpassed him by the privilege of the priesthood.
Thus Melchizedek is higher than Abraham, and Abraham is higher than Levi and all those who came from him.
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And he blessed the one who had the promises. That is, he blessed the one who had the promises of blessing. For God, as was said above, spoke to Abraham: In blessing I will bless you, and so forth.
The Apostle deliberately touched here upon the promises, because the Hebrews everywhere boasted in these promises.