דברים, פרק ט׳, פסוק י״ח

Following the catastrophe of the Golden Calf, repairing the relationship between God and the Israelites required an extraordinary, almost superhuman effort. Atonement was not an immediate result but demanded complete self-nullification and intense, prolonged prayer. Moses physically threw himself face-down on the earth [אבן עזרא, ביאור יש״ר]. This posture of total submission was one of three positions he adopted during his prayers, alongside sitting and standing [רבנו בחיי].

The exact setting of this forty-day period of supplication is a matter of differing perspectives. The primary approach among commentators is that this represents a middle period of forty days on Mount Sinai [רש״י, מזרחי, שפתי חכמים, גור אריה, דברי דוד, משכיל לדוד]. In this view, Moses ascended the mountain three times: first to receive the initial tablets, a second time dedicated entirely to pleading for mercy while strict judgment and anger prevailed, and a third time to receive the second tablets, culminating in complete forgiveness on the Day of Atonement. Conversely, another perspective suggests Moses only ascended the mountain twice, and this intense period of fasting and prayer actually took place in his private tent outside the camp. Because these efforts were hidden from the people, Moses reveals them later to emphasize the gravity of their sin and the immense exertion required for their atonement [שד״ל, חזקוני]. A third view proposes that Moses did not fast and pray continuously; rather, he ascended the mountain daily for a specific, focused prayer while spending the rest of his time managing the daily needs of the camp [העמק דבר].

Moses compares this period of intercession to his initial time on the mountain. Some explain this as a practical comparison, noting that he abstained completely from food and water for forty days just as he had done before [רלב״ג, שד״ל, רש״ר הירש]. However, many commentators emphasize a profound shift in his objective. His initial prayer immediately following the sin was merely to halt the imminent destruction of the nation. Now, applying the same intensity as before, he dedicated an entire forty-day period to securing genuine forgiveness and completely uprooting God's lingering wrath [רא״ש, בכור שור, דעת זקנים, הדר זקנים, מלבי״ם].

The absolute abstention from food and water served deeper spiritual purposes. Some view it as a personal necessity for Moses. Having descended to interact with a sinful nation, he had lost a degree of his supreme spiritual elevation and required another forty days of total detachment from the physical world to purify himself and become worthy once more of the Divine presence [אלשיך]. Alternatively, the forty days and nights of fasting corresponded exactly to the number of fasts required to achieve personal atonement for every single individual among the Israelites [פני דוד].

The underlying tragedy of the sin was that it deeply offended God. This offense was not simply a matter of provoking Divine anger or a desire for retribution; rather, it represented a fundamental betrayal that caused profound sadness, pain, and sorrow [שד״ל, ביאור יש״ר, רש״ר הירש]. The sin severely damaged the direct relationship with God, necessitating such an overwhelming and powerful effort by Moses to mend the deep fracture between Him and His people [רבנו בחיי].