Because Christ also suffered for sins once, the righteous for the unrighteous, that he might bring you to God; being put to death in the flesh, but made alive in the spirit;
once for all -- (cf. Romans 6:10; Hebrews 9:26, Hebrews 9:28; Hebrews 10:10) is clearly a contrast with the Old Testament yearly sacrifice on the Day of Atonement and declares the complete sufficiency of Christ’s death. -FSB