7:23 Now there have been many of those [the priests of Aaron’s line] priests [according to Josephus, approximately 83 high priests served Israel from Aaron (first high priest) to fall of second temple in AD 70], since death prevented them from continuing in office [the office, rather than the person, continued];
7:24 but because Jesus lives forever [in contrasts to the many priests who died and were succeeded by others (7:23)], he has a permanent priesthood.
7:25 Therefore he [Christ alone; no one can add to His work] is able to save completely [absolutely and for all time] those [Jesus paid the price for our sins once for all (cf. Heb. 9:24-28)] who come to God through him [cf. Acts 4:12], because he always [perpetual and continuous; not just once a year like the high priests] lives to intercede for them [those who come to God through Him].
7:26 Such a high priest meets our need—one who is holy [Jesus knew no sin], blameless [Jesus is without evil and completely innocent], pure [undefiled, unstained, uncontaminated], set apart from sinners [Christ’s sinless character sets Him apart from all others], exalted above the heavens [His present position (cf. Heb. 1:3); greater than earthly high priests; represents us in God’s presence].
7:27 Unlike the other high priests, he does not need to offer sacrifices day after day [no single animal sacrifice could permanently remove the stain of sin], first [before he could offer sacrifices for the sins of others] for his own sins, and then for the sins of the people. He [the perfect sacrifice] sacrificed for their sins once for all [His sacrifice took care of the penalty for sins “once for all” and ended the need for the sacrificial system] when he offered himself.
7:28 For the law appoints as high priests men who are weak [high priests were not perfect, sinful, and eventually dies]; but the oath [cf. Heb. 7:21], which came after the law, appointed the Son, who has been made perfect forever.