Following the overwhelming revelation at Mount Sinai, the Israelites are struck with deep existential fear about continuing their direct encounter with God. This terror seems puzzling, as moments earlier they had just declared that a human being could hear His voice and survive. The gap is explained by distinguishing between a single event and a continuous experience. While the people endured the initial revelation, they feared that an ongoing, relentless series of divine interactions would create an overwhelming, cumulative impact resulting in certain death [ברכת אשר על התורה בשם אברבנאל].
The threat to their survival came from two main sources. First was the sheer sight of the divine fire, which they feared would physically consume them. Second was the act of hearing. The voice of God originates from a realm beyond all worlds, and listening to it demands strength far beyond human limits [העמק דבר, ביאור שטיינזלץ]. Furthermore, the miracle that had allowed them to survive the initial encounter had already achieved its goal. The people assumed God would not sustain a supernatural miracle without a specific reason, meaning any further exposure would naturally cost them their lives [מלבי״ם].
This profound terror led the nation to a major theological breakthrough. They felt that the sheer intensity of divine energy accompanying the laws of the Torah would cause their souls to separate from their bodies. Through this harrowing experience, they grasped the immense gap between an ordinary prophet and one chosen to receive the Torah. They understood that no human being could bear the weight of this prophecy except Moses, a realization that firmly and permanently cemented their faith in him and the absolute truth of his teachings [ביאור יש״ר].
Taking a completely different approach, the [חתם סופר] shifts the focus from an immediate physical threat to a spiritual wish concerning the end of life. According to this view, the Israelites were not afraid of dying at that moment. Instead, they were expressing a deep desire about how they would eventually pass away. The intense fire they witnessed represents harsh judgment and the angel of death, and the people asked to be spared from dying in such a severe manner. Rather, they hoped to pass away through the continuous act of hearing God. They wished for an end of life brought about by an increase in spiritual understanding and divine revelation, ultimately leaving this world through the gentle passing reserved only for the righteous.