For every high priest is taken from among the people and appointed to represent them before God, to offer both gifts and sacrifices for sins.

For every high priest is appointed to offer both gifts and sacrifices. So this one too had to have something to offer.

for then he would have had to suffer again and again since the foundation of the world. But now he has appeared once for all at the consummation of the ages to put away sin by his sacrifice.

When he says above, “Sacrifices and offerings and whole burnt offerings and sin-offerings you did not desire nor did you take delight in them” (which are offered according to the law),

And every priest stands day after day serving and offering the same sacrifices again and again – sacrifices that can never take away sins.

He has no need to do every day what those priests do, to offer sacrifices first for their own sins and then for the sins of the people, since he did this in offering himself once for all.