How does Christ open the fountain of cleansing for His people?

In Zechariah 13:1, the prophet speaks of a fountain opened for sin and uncleanness, which anticipates the work of Christ at the crucifixion. When Jesus was pierced on the cross, His side flowed with blood and water, symbolizing the dual aspect of redemption: atonement for sin and cleansing from impurities. This fountain of cleansing assures believers that when they come to Christ in faith, their sins are not only forgiven but they are also cleansed of their guilt and shame. This cleansing is a permanent and transformative work that enables Christians to stand blameless before God.