'Remission' in the Bible

To give His people the knowledge of salvationBy the forgiveness of their sins,

In Him we have redemption [that is, our deliverance and salvation] through His blood, [which paid the penalty for our sin and resulted in] the forgiveness and complete pardon of our sin, in accordance with the riches of His grace

In fact under the Law almost everything is cleansed with blood, and without the shedding of blood there is no forgiveness [neither release from sin and its guilt, nor cancellation of the merited punishment].

Now where there is [absolute] forgiveness and complete cancellation of the penalty of these things, there is no longer any offering [to be made to atone] for sin.