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.

 (iii) The Christian is chosen for obedience and for sprinkling by the blood of Jesus Christ. In the Old Testament there are three occasions when sprinkling with blood is mentioned. It may well be that all three were present in Peter's mind and that all three have something to contribute to the thought behind these words. 