What does the Bible say about the significance of Jesus' blood and water?

In John 19:34, we see the piercing of Jesus' side resulting in both blood and water flowing out. This act is deeply symbolic in Reformed theology; the blood of Christ represents our justification, through which we are declared righteous before God. The water signifies our sanctification, indicating the ongoing cleansing and renewal of the church, which is brought about by the Holy Spirit. Both elements affirm the completeness of Christ's work in salvation, drawing connections to Old Testament themes where the unbroken bones of the Passover lamb (Exodus 12:46) point to Jesus as our Passover Lamb, fulfilling the Law and establishing a new covenant through His sacrifices.