משלי, פרק כ״ה, פסוק י״ט

The pain of betrayal cuts deepest when support is desperately needed. King Solomon illustrates the bitter disappointment of relying on an untrustworthy person during a crisis, comparing this false security to the sudden failure of one's own body parts exactly when they are called into action. The primary approach among commentators is that this imagery captures a broken, loose tooth and a slipping foot. Naturally, a person expects their teeth to easily chew their food and their feet to carry them safely on their journey [רלב״ג]. However, just as a broken tooth suddenly sends a shock of pain during a meal, or a weak foot gives out right when a person tries to run or lean on it, placing trust in a disloyal person results in a sudden collapse on the day of distress, precisely when their help is needed most [מצודת דוד, עמנואל הרומי]. In fact, relying in vain on a flawed source of support causes much greater heartbreak and frustration than having no support at all [ביאור שטיינזלץ].

Offering a different perspective on the physical imagery, the crumbling support can be pictured as a jagged rock or cliff edge, painting a scene of a person's foot slipping while trying to stand on a broken stone [אבן עזרא]. Another approach focuses on the inherent nature of the betrayer. In Jewish law, the tooth and the foot represent categories of damages whose natural tendency is to cause harm simply by eating or walking. Similarly, it is the fundamental nature of a traitor to cause damage. Therefore, someone who places their trust in such an individual should not be surprised when they are harmed in a time of trouble, as the betrayer is merely acting according to their destructive habits [אלשיך].

Furthermore, a single betrayal can trigger a broader collapse. Just as the inability to chew food properly due to a broken tooth will eventually deprive the body of nourishment and cause the legs to lose their strength, trusting in one treacherous support will inevitably pull down everything else a person relied upon [מלבי״ם]. Finally, the moral lesson can be directed at the betrayer rather than the victim. A person who lives a life of disloyalty will ultimately face their own day of great distress, like the day of death. At that moment, they will discover that their own personal security is as fragile as a broken tooth or a slipping foot, leaving them with no good deeds to protect them or speak on their behalf [עמנואל הרומי].