Verses for thy transgressions

I, even I, am he that blotteth out thy transgressions for mine own sake, and will not remember thy sins.

I have blotted out, as a thick cloud, thy transgressions, and, as a cloud, thy sins: return unto me; for I have redeemed thee.

If thou sinnest, what doest thou against him? or if thy transgressions be multiplied, what doest thou unto him?