The gradual conquest of the Promised Land presented the Israelites with a significant temptation. Exhausted by continuous warfare, the natural human urge would be to seek rest and forge peace agreements with the local inhabitants [מלבי״ם]. Against this backdrop, a firm boundary is established to prevent any acceptance of the pagan culture deeply rooted in the land. The forbidden agreement is not a mutual treaty between equals. Rather, it represents a victor granting amnesty to a defeated enemy [קאסוטו]. It is a strict warning against guaranteeing the survival of the local inhabitants or consenting to their continued presence in the land [רמב״ן, אבן עזרא].
A central focus of this restriction is the unbreakable link between the people and their gods, which is understood in several ways. On a practical level, it forbids accepting any terms of surrender where the defeated nations request to keep their monuments and idols intact in exchange for peace; instead, these objects of worship must be entirely destroyed [אבן עזרא, ביאור יש״ר]. From a psychological and social perspective, granting amnesty to the people inevitably means accepting their gods, as it is impossible to truly force individuals to abandon the faith of their upbringing [שד״ל, קאסוטו]. Allowing idolaters to remain, even temporarily, would ultimately lead to cultural assimilation and cause the Israelites to sin [רלב״ג]. Furthermore, on a deeper spiritual level, forging a pact with an idolater is considered equivalent to making a pact with the idolatry itself, because the essence of the false worship is embodied within the one who practices it [אור החיים].
Despite the severity of these warnings, the primary approach among commentators is that the prohibition is not an absolute ban on the people themselves. Instead, it is entirely dependent on their spiritual state. The restriction applies only as long as the inhabitants hold fast to their idols. If they actively reject idolatry, abandon their false gods, and accept the basic moral framework of the Noahide laws as resident aliens, it is permissible to make a treaty with them, spare their lives, and allow them to dwell in the land. This conditional understanding clarifies historical events, such as how King Solomon was able to form a peaceful alliance with Hiram, King of Tyre, who had abandoned idolatry and gained the status of a resident alien [פענח רזא, פרדס יוסף].
Conversely, another perspective suggests that the law underwent a historical evolution. While a treaty with those who abandoned their idols may have been permitted at this early stage, the law became far more severe following the sin of the Golden Calf, expanding the prohibition to ban treaties with the people themselves entirely [העמק דבר]. Beyond the immediate historical context, a broader legal debate exists regarding the scope of this restriction. Scholars differ on whether the ban on treaties applies exclusively to the seven Canaanite nations or extends to all foreign nations, and whether it goes so far as to forbid basic diplomatic courtesies and polite, peaceful exchanges between countries [פרדס יוסף].