Following Caleb's attempt to inspire confidence, the spies noticed the people hesitating. To decisively crush any thoughts of entering the land, they escalated from delivering a discouraging military assessment to launching a deliberate campaign of propaganda [רמב״ן, אברבנאל, ביאור ישר]. They began fabricating outright lies [אבן עזרא, רמב״ן, טור הארוך], though some suggest they simply weaponized the truth as they saw it, using it with the malicious intent of breaking the nation's spirit [אבי עזר]. Knowing that Moses, Aaron, Joshua, and Caleb would immediately refute their claims, the spies avoided a public forum. Instead, they bypassed the leadership and went directly to the Israelites, moving stealthily from tent to tent to whisper their poisonous rumors to the masses [רמב״ן, אלשיך, קונטרס חיבה יתירה].
To lend credibility to their warnings, the spies emphasized that their reconnaissance had been exhaustive [העמק דבר]. They argued that if merely passing through the territory temporarily was enough to expose them to its destructive nature, attempting to settle there permanently would be catastrophic [אלשיך]. Their central argument was that the territory actively consumed its inhabitants. The primary approach among commentators is that the spies described an unbearably harsh climate with toxic air and an unforgiving environment. They claimed the local water and produce were so intensely potent that they shortened normal lifespans, leaving only massive giants capable of survival [רמב״ן, ספורנו, שד״ל, אברבנאל, רש״ר הירש]. Others suggest they warned of a mountainous, exhausting terrain that caused premature aging [פענח רזא], or a landscape ravaged by constant, deadly warfare [The Torah: Women's Commentary].
This perception of a lethal environment was fueled by a profound misunderstanding. As they traveled, the spies had witnessed mass funerals everywhere. In reality, God had orchestrated this as a protective miracle, striking down Canaanite leaders so the population would be entirely consumed by mourning and ignore the foreign scouts. The spies, however, interpreted this divine intervention as proof of a deadly, plague-ridden land [רש״י, שפתי חכמים, כלי יקר, תורה תמימה].
Anticipating the counter-argument that these widespread deaths were simply the result of local sin, gluttony, or poor hygiene, the spies strategically described the inhabitants as men of great measure. This description served a dual purpose. First, it highlighted their physical enormity, comparing them to towering giants. The logic was terrifyingly simple: if the harsh environment could kill robust giants who were fully acclimated to the region, it would easily wipe out average, weaker Israelites arriving from the desert [רש״י, רלב״ג, אבן עזרא, ביאור שטיינזלץ, בכור שור, תולדות יצחק, אור החיים]. Second, it referred to the inhabitants' measured character and disciplined habits. The spies argued that the locals were not dying from reckless, unhealthy lifestyles, but were actually meticulous people who ate and drank in perfect moderation. If such exceptionally healthy and balanced individuals were dying in droves, it proved beyond a doubt that the fatal flaw lay entirely in the lethal environment of the land itself [הכתב והקבלה, אברבנאל, דעת זקנים, הדר זקנים, כלי יקר].