Why is it significant that Moses struck the rock twice?

The act of Moses striking the rock twice is significant as it reflects the misconception of repeatedly needing to provide sacrifice for sin. In doing so, Moses deviated from God's instruction, which was to speak to the rock after it had been struck once. This parallel illustrates that Christ, our ultimate rock, was struck once for the atonement of sin, emphasizing that His sacrifice need not be repeated. As noted in Hebrews 9:28, Christ was offered once to bear the sins of many, making the concept of re-sacrificing irrelevant for believers.