Neither by the blood of goats and calves, but by his own blood he entered in once into the holy place, having obtained eternal redemption for us.
All Commentaries on Hebrews 9:12 Go To Hebrews 9
George Leo Haydock
By the blood of goats This is another difference and pre-eminence of Christ above the priests of the law of Moses, that they could only offer the blood of beasts; but Christ entered into heaven by the effusion of his own precious blood in his sufferings, and on the cross, by this having found an eternal redemption for mankind, having satisfied for the sins of all men in the sight of God, which the former priests, with all their sacrifices, could not do. (Witham)
Eternal redemption. By that one sacrifice of his blood, once offered on the cross, Christ our Lord paid and exhibited, once for all, the general price and ransom of all mankind; which no other priest could do. (Challoner)
The force of the apostle's reasoning is to convince the Jews of the inefficacy of the legal sacrifices, and of the virtue of the Christian sacrifice.