Abide

Leviticus 17:11 KJV
For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.

The atonement mentioned here was temporary. The blood of bulls, goats, and lambs could cover sins but not purge it. This is also why the Holy Spirit could only come upon individuals in the Old Testament and not indwell them as He does you or me.

Jesus was the one who made the difference. No longer do we need a sacrifice every time we sin; instead, we need to repent and ask the Lord to forgive us (a much simpler process if you ask me). Paul explains why and how Jesus made this change in the book of Hebrews:

Hebrews 9:11-14 KJV
[11] 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; [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. [13] For if the blood of bulls and of goats, and the ashes of an heifer sprinkling the unclean, sanctifieth to the purifying of the flesh: [14] How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?

Christ’s blood purges us of sin entirely - as long as we abide in him. So let us abide.