“And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,”
King James Version (KJV)
7:15 And it is still far more evident, that - Both the priesthood and the law are changed, because the priest now raised up is not only of another tribe, but of a quite different order.
Heb 7:15 It is yet far more evident. Still more clear than that the new High Priest should be of the tribe of Judah. That could be shown by an argument, because it was affirmed (1) that the Christ was to be the Son of David; (2) David was of Judah; (3) The Christ was to be a priest. There ariseth another priest. On the other hand, without argument, is the clear affirmation that there was to be a new priesthood, a priest "after the similitude of Melchizedec".