שמות, פרק י״ד, פסוק י״ט

As the Egyptian army closes in on the Israelites at the edge of the sea, the familiar guides of their desert journey suddenly change roles. The Divine presence shifts from leading at the front to guarding the rear, marking a dramatic turning point where the natural order of day and night is suspended to create an impenetrable shield.

The primary approach among commentators is that the angel orchestrating this shift is a great heavenly prince or Divine messenger acting from within the cloud to direct it [אבן עזרא, רמב״ן, רשב״ם]. Others identify this presence as the pillar of fire itself [הטור הארוך, מלבי״ם], or as the sheer Divine power generating the unfolding miracles [רלב״ג]. A unique perspective suggests that the angel is actually Moses himself, who placed his own life in danger by moving to the rear guard to protect the people, as prophets are sometimes referred to as angels in the Biblical tradition [רלב״ג]. Alternatively, the initial mention of this heavenly entity is simply a general introduction, immediately clarified to mean the pillar of cloud [חזקוני, הדר זקנים]. Regardless of its exact identity, this backward movement had already taken place even before God gave His instructions to Moses [אבן עזרא].

This shift to the rear serves primarily to create a physical and visual barrier between the two camps [רשב״ם, קאסוטו]. Because the sea was splitting and the path forward was now clear, the Israelites no longer needed a guiding cloud at the front, allowing it to take up a defensive position behind them [ספורנו, העמק דבר]. This defense was highly tangible. The angel and the cloud acted as a shield, absorbing the arrows and catapult stones fired by the pursuing Egyptians [רש״י]. Although a spiritual entity cannot suffer physical harm, it accomplished this by wrapping itself within the dense, physical mass of the cloud [גור אריה, שפתי חכמים]. Furthermore, this rearward movement served to melt the frozen depths of the sea, turning the seabed into sinking mud specifically to trap the Egyptian pursuers [ספורנו].

During these critical hours, the Divine presence manifested through the attribute of strict justice. Following the people's recent complaints, the Israelites were undergoing a piercing heavenly trial to determine whether they truly deserved salvation or if they should perish alongside their oppressors [רש״י, רמב״ן, שפתי כהן, ברכת אשר]. However, this strict judgment transformed into mercy the moment the angel chose to absorb the physical attacks, effectively shielding the people and serving as their ultimate defender [ברטנורא, שפתי כהן].

The movement of the cloud also signals a suspension of the natural order. Normally, the daytime pillar of cloud would vanish completely at nightfall, replaced by the guiding pillar of fire. On this fateful night, the cloud did not disappear; instead, it relocated to the back of the camp [רש״י, קאסוטו, מלבי״ם]. This created a brilliant tactical advantage. The cloud plunged the Egyptian path into darkness, blinding them to the Israelites' exact location and concealing the reality that they were marching into a split sea rather than walking on ordinary terrain [אור החיים, מלבי״ם]. Simultaneously, the pillar of fire continued to illuminate the night for the Israelites. While the Egyptians could see the glow of the fire through the thick fog of the cloud and continued their slow pursuit, this double barrier of cloud and fire kept them entirely at bay, preventing them from ever reaching the people [רמב״ן, הכתב והקבלה].