I, even I, am he that blotteth out thy transgressions for mine own sake, and will not remember thy sins. Put me in remembrance: let us plead together: declare thou, that thou mayest be justified. Thy first father hath sinned, and thy teachers have transgressed against me. Therefore I have profaned the princes of the sanctuary, and have given Jacob to the curse, and Israel to reproaches.
Even though the Jews were disobedient to God, He would blot out their transgressions and forgive and forget their sins. He did this because of grace, as their entire history had been one unbroken record of sin and failure. Though they would be forgiven, they still had to suffer the consequences for their sin.