Why is it essential to recognize the rock was smitten only once?

It is essential to understand that the rock was smitten only once because this signifies the finality and completeness of Christ's redemptive work. Hebrews 9:26 states that Christ appeared once for all at the end of the ages to put away sin by the sacrifice of Himself. This stands in contrast to the Old Testament sacrifices, which had to be repeated. The one strike against the rock emphasizes that Christ, the cornerstone of our faith, completed all necessary work for our salvation in His one-time sacrifice. This truth assures believers that there is no need for further atonement, as Christ's death suffices for us eternally, inviting us to rest fully in His finished work.