7:12 For when the priesthood changes, a change in the law must come 1 as well.
Hebrews 7:27
7:27 He has no need to do every day what those priests do, to offer sacrifices first for their own sins and then for the sins of the people, since he did this in offering himself once for all.
1 tnGrk “of necessity a change in the law comes to pass.”