For when the priesthood is changed, of necessity there takes place a change of law also.
For the priesthood being changed, there is made of necessity a change also of the law.
For when there is a change in the priesthood, there is of necessity an alteration of the law [concerning the priesthood] as well.
When the order of the priest changes, there has to be a change in the Law as well.
For since the priesthood has been transferred, it is necessary that the law also be transferred.