Historical miracles serve as powerful anchors of faith, demonstrating God's absolute control over the natural world to save His people. Two foundational moments in the history of the Israelites stand out in this regard: the splitting of the Red Sea during the Exodus from Egypt, and the later crossing of the Jordan River under the leadership of Joshua. Recalling these ancient deeds [אבן עזרא] serves to highlight the awesome acts that struck terror into the surrounding nations [אלשיך].
These events carried a profound dual meaning, as a single divine action produced two entirely opposite results. On one side, it brought harsh judgment, destruction, and defeat to the enemies and their spiritual forces. On the other side, it delivered mercy and salvation to the Israelites. The splitting of the Red Sea also acted as a foreshadowing sign, proving that God would provide the exact same miraculous help when the people eventually crossed the Jordan to conquer their land [אלשיך].
The primary approach among commentators is that the intense joy experienced during these events belonged to the Israelites, who celebrated God's salvation and their freedom from exile [רד"ק, מצודת דוד]. This deep gladness was felt vividly when the Ark of the Covenant stood firm within the dry bed of the Jordan River [אבן עזרא], and it continued to resonate throughout the conquest of the land [ביאור שטיינזלץ]. Offering a different perspective, a unique interpretation suggests that the joy was not felt by the people, but rather by the sea itself, which rejoiced upon encountering the direct revelation of God [רש"י].
Beyond their historical impact, these ancient wonders point toward the Messianic era. The memory of crossing the sea and the river serves as a promise for the future redemption of the exiled Israelites. Just as God altered nature in the past, He will perform similar miracles in the future, safely leading His people across rivers on their final journey back to their homeland [מאירי].