Hebrews 8:4
If he were, however, still upon earth, he would not even be a priest, since there are already priests who offer the gifts as the Law directs.
Hebrews 5:1
Every High Priest, taken from among men, is appointed as a representative of his fellow-men in their relations with God, to offer both gifts and sacrifices in expiation of sins.
Hebrews 7:11-15
If, then, Perfection had been attainable through the Levitical priesthood--and it was under this priesthood that the people received the Law--why was it still necessary that a priest of a different order should appear, a priest of the order of Melchizedek and not of the order of Aaron?
Hebrews 11:4
Faith made the sacrifice which Abel offered to God a better sacrifice than Cain's, and won him renown as a righteous man, God himself establishing his renown by accepting his gifts; and it is by the example of his faith that Abel, though dead, still speaks.