After years of longing and silence, the prolonged barrenness of Isaac and Rebekah reaches a dramatic turning point. Confronted with an inability to conceive naturally, they turn to God in a profound display of spiritual exertion that ultimately alters the course of nature and secures the continuation of their lineage. The narrative subtly indicates that this physical limitation was not Rebekah's alone; Isaac himself was inherently barren [מנחת שי, רס״ג, קיצור בעל הטורים, ברטנורא]. The primary approach among commentators is that God deeply desires the prayers of the righteous. By introducing barrenness and difficulty, God compels them to persist in His service, drawing them closer and reinforcing their absolute dependence on Him [רס״ג, רבנו בחיי, תורה תמימה]. Others suggest deeper spiritual and historical motives. Bringing high, holy souls into the world requires miraculous divine intervention that transcends the natural order [מלבי״ם]. Additionally, this delay served to postpone the birth of Esau until after the passing of Abraham, sparing the patriarch the sorrow of seeing his grandson abandon the righteous path [רבנו בחיי]. Furthermore, because Rebekah descended from the family of Laban the Aramean, a profound miracle was necessary to uproot the cruel nature inherent in her ancestral background [העמק דבר].
Their response to this challenge was not a routine supplication, but an intense, persistent pleading characterized by immense spiritual effort [רש״י, רד״ק, אבן עזרא, גור אריה]. The nature of this prayer is understood through two powerful metaphors. First, it is compared to a pitchfork turning grain on a threshing floor. Just as the tool overturns the harvest, the intense prayers of the righteous have the power to overturn God's attributes, shifting strict judgment and anger into boundless mercy, and fundamentally altering the natural order of creation [תורה תמימה, רבנו בחיי, מחוקקי יהודה]. Second, the prayer is likened to the thick smoke of incense rising forcefully upward. Their supplication soared to the heavens and was favorably received before God [שד״ל, רש״י, אם למקרא].
The physical and emotional dynamics of their prayer are deeply intertwined. Physically, Isaac and Rebekah stood in opposite corners of the room, facing one another. This allowed them to align their hearts toward the same spiritual goal without distracting each other [רש״י, גור אריה, משכיל לדוד]. On an intentional level, Isaac directed his prayers specifically for his wife. Although God had already promised Isaac that He would grant him offspring, his profound love for Rebekah prevented him from taking another wife or a maidservant. Instead, he fervently pleaded that the promised lineage would come exclusively from the righteous woman standing across from him [ספורנו, רד״ק, בכור שור]. Some interpret this dynamic as a prayer for physical endurance, explaining that Isaac asked God to grant Rebekah the strength and vitality required to conceive and endure a pregnancy [הכתב והקבלה], or to heal and physically restore her body [קונטרס חיבה יתירה].
When the divine response finally comes, it is directed specifically toward Isaac. The primary approach among commentators is that the prayer of a righteous person who is the child of a righteous person, such as Isaac the son of Abraham, operates on a different plane than the prayer of a righteous person who is the child of a wicked person, like Rebekah the daughter of Bethuel [רש״י, תורה תמימה, צאינה וראינה]. This distinction does not diminish Rebekah's immense righteousness; her prayers were entirely worthy of being accepted in their own right. However, Isaac's prayer was bolstered by the merit of his ancestors, allowing it to be answered more swiftly. Isaac is compared to a member of the King's own household whose requests are granted immediately, while Rebekah lacked that specific ancestral advantage [משכיל לדוד, פני דוד, פרדס יוסף]. Ultimately, the nature of God's response implies a divine yielding. God allowed Himself to be appeased and persuaded by Isaac's relentless request, agreeing to suspend the laws of nature to grant them a child [רש״י, דברי דוד, אבן עזרא].