Hebrews 7:5-7

[5]Now the law of Moses required that the priests, who are descendants of Levi, must collect a tithe from the rest of the people of Israel, who are also descendants of Abraham.

[6]But Melchizedek, who was not a descendant of Levi, collected a tenth from Abraham. And Melchizedek placed a blessing upon Abraham, the one who had already received the promises of God.

[7]And without question, the person who has the power to give a blessing is greater than the one who is blessed.