דברים, פרק ו׳, פסוק ט״ז

True faith does not rely on constant proof or conditional terms, but rather on an unconditional, inner devotion to God. The primary approach among commentators is that the warning against testing God is directed at conditional worship. A person must not decide to follow the commandments merely to check if they will be rewarded with success, secretly planning to abandon their faith if God does not provide a favorable outcome [רמב״ן, הטור הארוך, רבנו בחיי, בכור שור, צאינה וראינה, מלבי״ם]. Instead, worship must stem from complete love, which includes accepting times of sorrow and tragedy with faith, recognizing that the ways of divine justice are hidden from human understanding [רמב״ן, הטור הארוך, רבנו בחיי]. Furthermore, one should not perform a specific commandment simply to see if its promised reward will materialize. A person may have hidden spiritual debts that prevent the reward from arriving, and treating the commandment as a test could easily lead to a crisis of faith or heresy [תורה תמימה].

There are specific exceptions to this rule. A person is permitted to test God in the realm of charity and tithes, as explicitly promised in the book of Malachi [רבנו בחיי]. Similarly, it is permissible to give charity with the specific intention that a sick family member will be healed, provided this act is accompanied by deep prayer rather than presented to God as an ultimatum or a test [מלבי״ם].

Beyond conditional worship, another dimension of this prohibition involves the demand for ongoing miracles and proofs. Because the truth of the Torah and the authenticity of Moses as a prophet were already established through undeniable signs, it is considered sinful to demand further miracles or to test a prophet whose truthfulness has already been proven [רמב״ן, הטור הארוך, רלב״ג, מלבי״ם]. God does not perform miracles for every person at all times [רמב״ן, הטור הארוך]. The era of open miracles during the Exodus from Egypt was specifically necessary to establish a foundation of faith for the nation in its early days. Once that foundation was set, the expectation is that people will stop demanding supernatural evidence and instead recognize God's presence and guidance within the normal flow of nature and history [רש״ר הירש]. Therefore, even during times of war or distress, a person should pray for God's help out of pure faith, rather than using the crisis as a test to prove His existence or power [העמק דבר, ביאור שטיינזלץ].

This warning is deeply rooted in a specific historical failure at a location known as Massah, which was in Rephidim. The place was named after an incident that occurred shortly after the Israelites left Egypt [רש״י, אבן עזרא, שד״ל, רבנו בחיי, ברכת אשר]. During that event, the people demanded water before they were truly thirsty [העמק דבר] or facing any pressing existential need [רלב״ג]. They essentially issued an ultimatum, asking whether God was truly among them. Their underlying condition was that if God provided water through a miracle, they would continue to follow Him, but if He did not, they would abandon Him [רמב״ן, רש״י, אבן עזרא, הטור הארוך, רבנו בחיי, חזקוני]. The ultimate message is a permanent warning for all future generations to never return to that destructive pattern of doubtful, conditional faith.