At an advanced stage of their desert journey, forced to bypass the land of Edom, the prolonged and exhausting route breeds severe resentment among the Israelites. They direct harsh, critical complaints against both God and Moses, employing a tone of accusation rather than presenting a standard plea for help [נתינה לגר]. Commentators debate the exact nature of this offense. Some emphasize the severity of equating the servant, Moses, with God, or suspecting that Moses acted maliciously on his own initiative rather than following divine orders [רש״י, תורה תמימה, ברכת אשר]. Conversely, others maintain that the people knew perfectly well Moses was fulfilling God's mission. Instead, their grievance was directed at the divine leadership itself, and at Moses for accepting this reality without praying for a change. This approach views their outburst as outright slander against Heaven [אור החיים, ביאור יש״ר, מלבי״ם].
The people's cry about a lack of bread and water seems puzzling, given that the Manna fell daily and Miriam's well provided a steady water supply. The primary approach among commentators is that the Israelites were not suffering from an absolute lack of sustenance, but rather from an absence of natural, ordinary food. They had grown weary of their daily dependence on miracles. Instead of the constant anxiety of waiting for food to descend from heaven each morning, a system originally designed to instill deep trust in God, they desired the security and stability of possessing a multi-day supply of grain. Furthermore, the physical exhaustion of their long detour around Edom generated a craving for heavy, satisfying meals. The miraculous Manna and water were uniquely spiritual and light, digesting rapidly without providing the enduring physical fullness and strength needed for a strenuous desert trek [אור החיים, כלי יקר, העמק דבר, מלבי״ם].
This frustration culminated in a profound disdain for the Manna, which they derisively labeled as light and worthless. Some explain that they viewed it as meager and entirely lacking in substance [אבן עזרא, רשב״ם, חזקוני]. However, the Manna's effortless digestion also triggered genuine physical panic. Because the heavenly food was absorbed completely into their bodies without producing any physical waste, the people feared it was accumulating and swelling within their intestines. They anxiously reasoned that a human being cannot eat without eventually expelling waste. Consequently, they transformed a profound miracle, one intended to elevate them to the pure state of ministering angels, into a source of paranoia and ungrateful complaint [רש״י, גור אריה, צאינה וראינה]. It is suggested that only at this late stage of their forty-year journey, as they approached settled regions and began purchasing regular grain, did they notice the stark difference in digestion and begin to fear the long-term effects of the Manna [חתם סופר].
Because this outburst stemmed from sheer impatience rather than genuine starvation or thirst [רלב״ג], the Israelites faced a precise, measure-for-measure punishment. God sent venomous snakes against them, a deeply symbolic choice. The primordial serpent committed the first act of slander against God in the Garden of Eden, making it the fitting agent to strike those who now slandered God and Moses. Additionally, the serpent was cursed to taste only dust regardless of what it eats. It was therefore the perfect creature to punish a people who were provided with a miraculous food capable of taking on any flavor, yet chose to despise it. This punishment did not require a new act of creation. The desert was always teeming with snakes and scorpions, but the protective Clouds of Glory had consistently shielded the Israelites by destroying these threats in their path. The moment the people denied God's goodness, this special divine protection was lifted, leaving them exposed to the deadly, natural elements of the wilderness [רבנו בחיי, תולדות יצחק, כלי יקר].