When a leader is sent to redeem a nation, the greatest obstacle is often the skepticism of the people. To overcome this, God provides undeniable proof of revelation, addressing these fears by linking the messenger to the ancient, deep-rooted faith of the nation. God instructs Moses to perform the sign of turning his staff into a snake in front of the Israelites so that they will believe him [רמב״ן, שד״ל, הטור הארוך, אבן עזרא]. This act serves as a decisive proof for Moses to present to the people he is sent to save [ביאור שטיינזלץ]. Another perspective views God's words as a direct, unbroken response to Moses's earlier fear that the people would not believe him. By answering Moses's exact concern and swiftly moving to the next sign, God leaves no room for further doubt [ביאור יש״ר, קאסוטו].
The physical transformation of the staff into a snake and back again carries deep symbolism regarding both the state of the nation and the abilities of Moses. Moses worried that the Israelites had been drawn after false beliefs and had sunk into impurity, making them unable to trust him. The sign shows that the core of the nation is holy, like a staff, and their descent into the state of a snake is only temporary. The act of grabbing the snake by its tail hints at the covenant of circumcision sealed in their flesh, guaranteeing their hope to rise and stand tall once again as a holy staff [פרדס יוסף]. Furthermore, the sign represents the dramatic shift the nation is about to experience. Just as the tail of the snake turns into the head of the staff, the Israelites will rise from their lowly status as a tail to become the head and leaders of their generation [העמק דבר].
For Moses himself, gaining control over the snake proves his power to subdue material forces and elevate them to a state of holiness and spirituality. While other nations denied the possibility that God could rest His presence on physical human beings and speak with them, this sign proves that Moses has become a man of God, fully worthy of prophecy [מלבי״ם]. The very act of controlling a snake is unnatural, proving beyond any doubt that the person performing it has truly experienced a divine revelation [אור החיים].
The explicit mention of the God of their fathers, the God of Abraham, Isaac, and Jacob, is essential. Unlike other nations, the Israelites already know that prophecy is possible because it was present among their ancestors who clung to God [מלבי״ם]. Repeating the names of the forefathers echoes the initial revelation at the burning bush and is designed to plant complete and absolute faith in the words of Moses [קאסוטו]. Finally, detailing the patriarchs teaches a lesson about how divine providence works. God chooses to act and bring salvation specifically through someone who might appear young or unimportant in the eyes of his generation. The revelation came to Moses not merely because of his personal standing, but primarily because he serves as the messenger of the God of their fathers [העמק דבר].