For when the priesthood is changed, the law must be changed also.
OJBFor when there is a “changing of the guard” of the Kehunah (Priesthood), this behechrach (necessarily) also affects the Torah.
TCENTFor when the priesthood is changed, the law must also be changed.
T4TBut we know they were not adequate, because a new type of priest like Melchizedek has come. And since God has appointed a new type of priest, he also had to change the regulations concerning how priests were appointed {he appointed priests}.