Hebrews 9

When talking about redemption through Jesus' blood verses 15-16 says, "Therefore he is the mediator of a new covenant, so that those who are called may receive the promised eternal inheritance, since a death has occurred that redeems them from the transgressions committed under the first covenant.  For where a will is involved, the death of the one who made it must be established."  When a will is involved there is one who receives it, one who dies to pass it on, and one who bestows the will.  Jesus is not only the one who dies , but He is also the one who bestows that will.  It is through Him we are redeemed.  Unlike the earthly sacrifices Jesus need only to die once where as the earthly sacrifices needed to given over and over.