"Under the blood" is a phrase some people use to explain what they believe happens to our sins when we confess them, and ask Jesus to forgive us for them. They believe those sins are
hidden "under the blood" that Jesus bled at Mt. Calvary.
I struggle with the phrase because I don't believe our sins are "under the blood" so much as they are washed in the blood.
There is a huge difference between a covering and a cleansing. The work that Jesus did on the cross goes far beyond a blood covering. His work was so perfect that anyone who calls on Him in faith & repentance experiences a complete washing away of sins - forever.
Peter claimed that removal of sin could not come without repentance (
Acts 2:38). This means that sin can not be ignored, overlooked or tolerated. In fact, there is only one thing to do with sin. Repent.
To repent means to turn around. Top stop sinning. To express sorrow for wrong actions.
With that in mind, we should remember that unrepentant sinners stand in grave danger of the judgment of God. Their sins are neither covered nor washed. I am not required to forgive an offense that God Himself has not forgiven, and neither are you. There can be no reconciliation until contrition is evident.
We are all sinners. We all need mercy and forgiveness. But forgiveness is not available to those who refuse to acknowledge they need it.
It may be politically incorrect to say so, but some things are not "under the blood."