משלי, פרק י״א, פסוק ט״ו

Assuming responsibility for an unknown person or a foreign idea is a path paved with immense risk, capable of causing both financial and spiritual ruin. A symbolic handshake to seal a promise or guarantee a loan may seem like a simple gesture, but it carries the heavy weight of legal obligation and potential destruction.

The primary approach among commentators focuses on the financial realities of loans and guarantees. When a person agrees to back the debt of a stranger whose character and reliability are unknown, they are likely to face absolute financial ruin and deep regret. Conversely, a person who avoids making financial promises on behalf of others protects themselves and lives in security [ביאור שטיינזלץ, אבן עזרא, מצודת דוד, עמנואל הרומי].

There are varying degrees of risk within these agreements. While backing a stranger is dangerous even in a standard arrangement, an absolute guarantee—where the lender can collect the funds directly and immediately from the guarantor—presents a far greater threat. A cautious individual will avoid making this level of commitment even for a close friend, ensuring they are not suddenly forced to pay the debt [מלבי״ם].

However, this reality creates a difficult social dynamic. Wealthy individuals are often afraid to lend money to the poor without a guarantor. Yet, potential guarantors are terrified of a double misfortune: being forced to pay the debt out of their own pocket, and subsequently ruining their relationship with the borrower while trying to collect the money back. This deep fear of guarantees can make the commandment of lending feel like a heavy burden, ultimately harming the poor who desperately need assistance [אלשיך].

Beyond the realm of finance, these concepts extend deeply into matters of the mind and faith. Taking on a foreign obligation can represent a wicked person who commits their heart to idol worship, joining hands with others to pursue evil and follow the counsel of sinners [רש״י]. Others view the stranger as a symbol for physical desires and the evil inclination, which are entirely foreign to a person's spiritual and intellectual nature. An individual who gives space to these material forces brings about their own spiritual destruction. In contrast, a secure person refuses to surrender to these desires, relying instead on their intellect and the providence of God [רלב״ג, עמנואל הרומי]. Similarly, this danger applies to the influence of foreign beliefs. Those who eagerly join hands are seen as fools who spread false ideas and proudly declare their corrupt faith. A complete individual despises their company, placing their trust entirely in a pure faith in God [אמרי דעת].