“For the priesthood being changed, there is made of necessity a change also of the law.”
King James Version (KJV)
7:12 For - One of these cannot be changed without the other.
Heb 7:12 For the priesthood being changed. The law as given "under the Levitical priesthood" (Heb 7:11), and was all grouped around the priesthood as its very center. There is made of necessity a change also of the law. Of course, if the priesthood was changed, the law of the old priesthood, the law of Moses, must go with it, and give place to a new law.