according to the foreknowledge of God the Father, in sanctification of the Spirit, that you may obey Jesus Christ and be sprinkled in his blood: Grace to you and peace be multiplied.
Notice that both human and divine agencies are involved and that both "obedience and sprinkling"--in that order--are needed. Obedience comes before the sprinkling of blood or cleansing from sin. That is the order given throughout the New Testament (Acts 2:38; Mark 16:15-16).