1 Jn 3:5, Heb 7:27, Heb 9:12
In the Old Testament, the high priests first offered sacrifices for their own sins, and daily sacrifices were made for the sins of the people. But because Jesus was without sin, He was sacrificed once for all to take away our sins forever.
Heb 9:23 It was therefore necessary that the patterns of things in the heavens should be purified with these; but the heavenly things themselves with better sacrifices than these. 24 For Christ is not entered into the holy places made with hands, which are the figures of the true; but into heaven itself, now to appear in the presence of God for us: 25 Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; 26 For then must he often have suffered since the foundation of the world: but now once in the end of the world hath he appeared to put away sin by the sacrifice of himself.
1 Jn 3:5 And ye know that he was manifested to take away our sins; and in him is no sin.
Heb 7:27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
Heb 9:12 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.