The Aaronic priesthood

points forward to · priesthood changed

Aaron's line served under death: each priest died and another took over. Hebrews contrasts that with a priest who continues forever and therefore saves completely.

points forward to · names on the heart

The breastpiece carries the twelve tribal names into the sanctuary, so the priest never enters God's presence alone.

grows out of · a mediator needed

Moses standing between God and a covenant-breaking people shows why Israel needs a permanent order of mediation, not a one-off intervention.