Hebrews 7:13 - Matthew Poole's English Annotations on the Holy Bible

For he of whom these things are spoken pertaineth to another tribe: that this priesthood was so altered, he proves by Christ's being of another tribe than Levi. This is a periphrasis, describing the priest after Melchisedec's order. Of whom was this said in Psalms 110:4, but of Christ, God-man, the royal High Priest of God? Matthew 21:42. He, as to his human nature, descended of the tribe of Judah, and not of Levi; and so the Aaronical priesthood was ended by him, Hebrews 2:14 Genesis 49:10. Of which no man gave attendance at the altar; of which tribe none was at priest, whose work was to attend the altar, and offer sacrifice; if any of another tribe pretended to, or would usurp it, God either smote them, as Uzziah, 2 Chronicles 26:18, or destroyed them, as those rebels, Numbers 16:1-3,28-35; neither was the priesthood hereby made tribual, or continued in any such tribe as in Levi, but confined to our Lord only, not because he descended of Judah, but extraordinarily selected of God out of it to discharge it.