"Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him. For in that he died, he died unto sin ONCE: but in that he liveth, he liveth unto God."
Romans 6:9-10, KJV
"But this man, [Jesus] because he continueth ever, hath an unchangeable priesthood. Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them. For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens; 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."
Hebrews 7:24-27, KJV
"But Christ being come an high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building; 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."
Hebrews 9:11-12, KJV
"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: Nor yet that he should offer himself often, as the high priest entereth into the holy place every year with blood of others; 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 . . . So Christ was ONCE offered to bear the sins of many; and unto them that look for him shall he appear the second time without sin unto salvation."
Hebrews 9:24-26, 28, KJV