Hebrews 8:4
Further, if he were still on earth, he would not be a priest at all, for there are priests enough provided to offer the gifts the Law prescribes??5 though the service they engage in is only a shadow and imitation of that in heaven. For when Moses was going to make the tent of worship he was warned, "Be sure to make it all just like the pattern you were shown on the mountain."
Hebrews 5:1
For every high priest who is chosen from among men is appointed to represent his fellow-men in their relations with God, and to offer gifts and sin-offerings.
Hebrews 7:11-15
Now if anything final had been really accomplished through the Levitical priesthood, for even the giving of the Law was based upon it, what further need would there have been of appointing a different priest of the priesthood of Melchizedek, instead of choosing one of the priesthood of Aaron?
Hebrews 11:4
Faith made Abel's sacrifice greater in the sight of God than Cain's; through faith he gained God's approval as an upright man, for God himself approved his offering, and through faith even when he was dead he still spoke.