At the foot of Mount Sinai, a profound tension emerged between the human desire to witness Divine revelation and the terrifying reality of standing before it. Overwhelmed by the sheer intensity of the encounter, the Israelites found themselves unable to endure direct communication with God, necessitating a mediator. Moses stepped into this role, bridging the gap between the Divine presence and the fragile human state.
The primary approach among commentators is that this mediation began during the revelation of the Ten Commandments itself. The Israelites were able to hear and comprehend only the first two Commandments directly from God. As the overwhelming power of the Divine voice became too much to bear, Moses took over, listening to the remaining Commandments and explaining each one clearly to the people [רמב״ן, רבנו בחיי, ביאור יש״ר, טור הארוך]. Others suggest that this shift occurred only after the events at Sinai; in this view, the entire nation heard all Ten Commandments directly, and Moses became the permanent messenger for the rest of the Torah's laws later on [אבן עזרא, מלבי״ם]. Regardless of the exact timing, Moses' position was strictly that of a faithful messenger transmitting God's word, not an independent lawmaker inventing rules on his own [רש״ר הירש].
The need for a mediator stemmed directly from the deep dread the Israelites experienced in the presence of the heavenly fire. Physically, Moses stood close to the Divine presence, while the people instinctively retreated, even though they were permitted to stand slightly closer [רמב״ן, טור הארוך]. While they were formally prohibited from ascending the mountain, their overwhelming terror would have kept them away even without such a restriction [אור החיים, רלב״ג]. This reaction was not merely a basic fear of physical harm. Rather, it was a profound awe of God's majesty, born from a stark realization of human insignificance when confronted with His boundless holiness [צרור המור]. Unlike Moses, who possessed the immense self-sacrifice required to step into the thick cloud despite the perceived danger, the people lacked the capacity to overcome their natural limitations [העמק דבר].
As Moses recounts these events, his description of acting as a mediator functions as a brief parenthetical thought. The primary approach among commentators is that God's introductory declaration, "I am the Lord your God," connects directly back to His initial face-to-face communication with the nation. The original Divine speech was delivered as one continuous flow, meaning the core message transcends the momentary pause detailing Moses' intervention [רש״י, רשב״ם, ספורנו, אבן עזרא, שד״ל, שפתי חכמים]. Alternatively, this pause in the narrative reflects a direct verbal confession from the Israelites. Their dread was not merely an internal feeling; they explicitly voiced their terror to Moses, stating clearly that they would not ascend because of the fire [רמב״ן, טור הארוך].
Interestingly, Moses' position as a mediator at Sinai ultimately served to protect the Israelites from destruction in the future. Because Moses stood alone near God, the Ten Commandments were delivered using the singular form of "you." Later, following the tragic sin of the Golden Calf, Moses used this specific phrasing to defend the nation. He argued before God that the commandment forbidding idol worship was phrased in the singular and therefore directed only at him, effectively softening the harsh judgment against the Israelites [תורה תמימה].