שמות, פרק ד׳, פסוק כ״ג

Before the mission to Egypt even truly begins, it reaches a dramatic climax with a severe ultimatum. God establishes a clear equation of divine justice: freedom in exchange for life. Speaking with God's absolute authority [ריב״א, רש״י], Moses is instructed to demand an absolute and permanent liberation. The goal is not merely a temporary exit for a brief ritual [ביאור שטיינזלץ], but a permanent shift in allegiance. The Israelites are to become God's servants forever, rather than remaining subjects of the Egyptian king [הכתב והקבלה, קאסוטו].

Because the Egyptian ruler repeatedly refuses to release God's firstborn [אבן עזרא, ביאור שטיינזלץ], he faces a perfectly mirrored consequence: the loss of his own firstborn son [ספורנו, בכור שור, חזקוני, אם למקרא, קאסוטו]. This threat specifically targets the crown prince, the heir to the royal throne [אבן עזרא הקצר]. Delivering such a message required immense courage and absolute trust in God [העמק דבר]. Unlike other disasters that would merely disrupt the nation's economy or comfort, this strikes at the very survival of the royal dynasty. Upon hearing such a direct threat to his lineage, the king could have easily lost his temper and ordered Moses killed on the spot.

The primary approach among commentators is that issuing this ultimate threat so early in the narrative is an act of divine kindness. While a human enemy conceals their plans to ensure a surprise attack, God reveals the most devastating blow well in advance, leaving the king a genuine opportunity to repent [רש״י, ספורנו, חזקוני, דברי דוד]. Furthermore, this early warning clarifies to both Moses and the king that the initial disasters will merely serve as signs and wonders. Only the final blow to the firstborn will be the true punishment that decides the battle and forces the liberation. Understanding this distinction allowed Moses to later pray for the removal of the earlier plagues without worrying that ending them would delay the Israelites' freedom [ספורנו, אבן עזרא הקצר, בכור שור, קאסוטו].

While the standard understanding is that this severe warning targets the Egyptian king, a unique perspective suggests it is actually directed at Moses himself. According to this view, God was angry that Moses brought his wife and children on the journey, fearing that concern for his family's safety might cause him to hesitate in his mission against a powerful monarch. Therefore, God warns Moses that if he becomes the cause of a delay in the Israelites' release, his own firstborn son will die. This interpretation links directly to the mysterious event at the inn shortly after, where God seeks to end the life of Moses's son [שד״ל]. However, other scholars fiercely reject this theory, dismissing it as absurd. They maintain that the clear context undeniably proves the warning is directed solely at the Egyptian ruler as a direct punishment for refusing to free the Israelites [אבן עזרא, אם למקרא].