Whoever is baptized in Christ is baptized through His suffering and blood, or, to state it more clearly, through Baptism he is bathed in the blood of Christ and is cleansed from sins. For this reason St. Paul calls Baptism a "washing of regeneration (Titus 3:5); and according to what Christians say and picture, the Sacraments flow from the wounds of Christ. And what they say and picture is right.
From "What Luther Says," page 47