Recognizing a profound shift on the horizon, Abimelech, the Philistine king, approaches Abraham to forge a historic, long-term alliance. Foreseeing that Abraham's descendants are destined to inherit the land, the king seeks to secure a peaceful future for his own people. He urges Abraham to make this commitment immediately, asking for an oath on the spot before any future circumstances can spark a conflict [שד״ל, שטיינזלץ, מלבי״ם]. Alternatively, the request to swear in that exact location is a matter of optics. By having Abraham swear in his own domain rather than in the royal palace, Abimelech ensures the covenant appears genuine, rather than a promise extracted under the pressure and fear of a foreign court [מלבי״ם].
The act of swearing itself carries immense weight. Rooted in the Hebrew word for the number seven, an oath represents a person submitting to absolute commitment under divine providence; breaking it severs an individual from the bond of life [רבנו בחיי, רש״ר הירש]. Yet, even in this sacred moment, a theological divide exists between the two leaders. A Midrashic tradition suggests Abimelech secretly wanted Abraham to swear by an idol hidden within the king's garments, but Abraham deliberately chose to swear by the God of truth [הרא״ש, תולדות יצחק].
In formalizing the agreement, Abimelech asks Abraham to swear that he will not deal falsely with him. The phrasing of this request functions as a firm negative command—a demand not to act deceitfully [רמב״ן, מחוקקי יהודה]—though it can also express a lingering sense of doubt [רד״ק]. Crucially, the specific language used for falsehood here refers not to speaking a lie, but to committing a deceptive act. Abimelech does not suspect Abraham of being untruthful in his speech. Rather, he fears an act of ingratitude, worrying that Abraham or his future descendants might repay his past goodness with harm [אבן עזרא, שד״ל, הירש, מחוקקי יהודה].
The requested alliance is explicitly limited to three generations: Abimelech, his son who would inherit the throne, and his grandson [רד״ק, העמק דבר]. This boundary reflects a basic reality of human nature. A person's natural compassion and emotional attachment generally extend only as far as their grandchildren. Furthermore, Abimelech understands the practical limits of his power; a leader cannot realistically bind distant, unborn generations to an oath [רש״י, שד״ל].
To secure this promise, the king asks for direct reciprocity based on his previous kindness. As the ruler, he had allowed Abraham, a foreigner, to settle freely and peacefully anywhere in his territory. Understanding that the balance of power will eventually flip, Abimelech anticipates a future where Abraham's descendants rule the region and the Philistines live under their authority. He asks that when Abraham's family inevitably takes control, they mirror his earlier generosity and refrain from expelling the Philistines [בכור שור, חזקוני, העמק דבר]. Finally, this plea for protection extends to the land itself. The primary approach among commentators understands this as a request for fair treatment of the general local population [רד״ק, רלב״ג], while others add that it includes a commitment to preserve the region's agriculture and produce without destroying it [רבנו בחיי].