18. The Apostle, having proved the institution of a priesthood, altogether different from that of Aaron, proceeds to account for the abrogation of the Levitical priesthood; under it, he includes the entire law, on which account he (verses 11 and 12) shows the inseparable connexion of both. They were abrogated, not because they were evil, but because they were weak and incapable of justifying man.
Hebrews 7:18