to be a reminder to the people of Israel, so that no one who is not a priest, who is not of the descendants of Aaron, should draw near to burn incense before the Lord, lest he become as Korah and as his company—as the Lord said to Eleazar through Moses.
By faith Abel offered to God a more acceptable sacrifice than Cain, through which he received approval as righteous, God bearing witness by accepting his gifts; he died, but through his faith he is still speaking.
He has no need, like those high priests, to offer sacrifices daily, first for his own sins and then for those of the people; he did this once for all when he offered up himself.
(which is symbolic for the present age). According to this arrangement, gifts and sacrifices are offered which cannot perfect the conscience of the worshiper,