A turning point arrives in the sequence of plagues striking Egypt, marking the beginning of a second cycle. While the initial plagues were designed to prove God's very existence, this new phase serves to demonstrate His direct, personal involvement in the world and to establish that the Israelites are His special people [מלבי״ם, אלשיך, קאסוטו]. This unique status is revealed gradually. First, God creates a geographical distinction by protecting the region of Goshen from the swarming animals. Later, He protects the Israelites' property and livestock from pestilence, and finally, He shields their very bodies from boils [אלשיך].
The confrontation is set for the early morning. This early warning is a consistent pattern for plagues that immediately follow a plague delivered without any prior notice [דעת זקנים]. Moses is instructed to stand firmly before the Egyptian ruler, projecting pride and complete fearlessness [רמב״ן]. His task is to inform the king, speaking through Aaron, that God is about to unleash vicious animals that will bring devastation upon the land [רלב״ג].
The setting for this warning is the riverbank during the king's morning routine, a location that draws a variety of fascinating explanations. A straightforward approach suggests it was simply customary for kings to visit the river in the morning to bathe, enjoy the pleasant view of the water, or perform religious worship [אבן עזרא, ביאור שטיינזלץ, קאסוטו]. However, another perspective views this location as a calculated public stage. Plagues that bring severe punishment and death require a public warning. Since the masses typically accompanied the king to the river, delivering the message there gave the Egyptian people an opportunity to cry out and urge their leader to change course. If they remained silent, their resulting punishment would be entirely justified [רמב״ן].
In sharp contrast, another interpretation frames this morning trip as an act of deep concealment. The Egyptian king had declared himself a god, claiming he was above basic human bodily functions. To maintain this illusion, he would sneak out to the water at dawn to relieve himself in secret. God commands Moses to surprise him at that precise, vulnerable moment, proving that God sees all hidden things and exposing the ruler as mere flesh and blood rather than a deity [שפתי כהן].
Alternatively, a different approach suggests the encounter actually takes place inside the palace, just before the king leaves for the water. Moses intercepts him indoors, surrounded by walls covered in Egyptian idols. This specific setting delivers a powerful message: even if the river remains undisturbed, God can still unleash wild animals to make the entire land completely uninhabitable [רש״ר הירש, ביאור יש״ר].